diff --git a/CHANGELOG b/CHANGELOG
index c5d301b67..f232df27c 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -1,5 +1,11 @@
 #Nmap Changelog ($Id$); -*-text-*-
 
+o [NSE] New rand.lua library uses the best sources of random available on the
+  system to generate random strings. [Daniel Miller]
+
+o [NSE] Collected utility functions for manipulating and searching tables into
+  a new library, tableaux.lua. [Daniel Miller]
+
 o [GH#1355] When searching for Lua header files, actually use them where they
   are found instead of forcing /usr/include. [Fabrice Fontaine, Daniel Miller]
 
diff --git a/nse_main.lua b/nse_main.lua
index 656024ee6..1afa26f23 100644
--- a/nse_main.lua
+++ b/nse_main.lua
@@ -266,17 +266,7 @@ end
 
 -- recursively copy a table, for host/port tables
 -- not very rigorous, but it doesn't need to be
-local function tcopy (t)
-  local tc = {};
-  for k,v in pairs(t) do
-    if type(v) == "table" then
-      tc[k] = tcopy(v);
-    else
-      tc[k] = v;
-    end
-  end
-  return tc;
-end
+local tcopy = require "tableaux".tcopy
 
 -- copies the host table while preserving the registry
 local function host_copy(t)
diff --git a/nselib/creds.lua b/nselib/creds.lua
index c56f08ccf..116070656 100644
--- a/nselib/creds.lua
+++ b/nselib/creds.lua
@@ -120,6 +120,7 @@ local ipOps = require "ipOps"
 local nmap = require "nmap"
 local stdnse = require "stdnse"
 local table = require "table"
+local tableaux = require "tableaux"
 _ENV = stdnse.module("creds", stdnse.seeall)
 
 
@@ -306,7 +307,7 @@ Account = {
 -- which will cause the table to yield its values sorted by key.
 local function sorted_pairs (sortby)
   return function (t)
-    local order = stdnse.keys(t)
+    local order = tableaux.keys(t)
     table.sort(order, sortby)
     return coroutine.wrap(function()
         for i,k in ipairs(order) do
diff --git a/nselib/data/http-default-accounts-fingerprints.lua b/nselib/data/http-default-accounts-fingerprints.lua
index 0a78bf4f7..9d60ee7e0 100644
--- a/nselib/data/http-default-accounts-fingerprints.lua
+++ b/nselib/data/http-default-accounts-fingerprints.lua
@@ -5,6 +5,7 @@ local math = require "math"
 local shortport = require "shortport"
 local stdnse = require "stdnse"
 local table = require "table"
+local tableaux = require "tableaux"
 local url = require "url"
 local have_openssl, openssl = pcall(require, 'openssl')
 
@@ -24,20 +25,6 @@ local have_openssl, openssl = pcall(require, 'openssl')
 -- * <code>login_check</code> - Login function of the target
 ---
 
--- Recursively copy a table.
--- Only recurs when a value is a table, other values are copied by assignment.
-local function tcopy (t)
-  local tc = {};
-  for k,v in pairs(t) do
-    if type(v) == "table" then
-      tc[k] = tcopy(v);
-    else
-      tc[k] = v;
-    end
-  end
-  return tc;
-end
-
 ---
 -- Requests given path using http.get() but disabling cache and redirects.
 -- @param host The host to connect to
@@ -47,7 +34,7 @@ end
 -- @return A response table (see library http.lua for description)
 ---
 local function http_get_simple (host, port, path, options)
-  local opts = tcopy(options or {})
+  local opts = tableaux.tcopy(options or {})
   opts.bypass_cache = true
   opts.no_cache = true
   opts.redirect_ok = false
@@ -66,7 +53,7 @@ end
 -- @return A response table (see library http.lua for description)
 ---
 local function http_post_simple (host, port, path, options, postdata)
-  local opts = tcopy(options or {})
+  local opts = tableaux.tcopy(options or {})
   opts.no_cache = true
   opts.redirect_ok = false
   return http.post(host, port, path, opts, nil, postdata)
@@ -172,7 +159,7 @@ end
 -- @see url.build
 ---
 local function url_build_defaults (host, port, parsed)
-  local parts = tcopy(parsed or {})
+  local parts = tableaux.tcopy(parsed or {})
   parts.host = parts.host or stdnse.get_hostname(host, port)
   parts.scheme = parts.scheme or shortport.ssl(host, port) and "https" or "http"
   if not parts.port and port.number ~= url.get_default_port(parts.scheme) then
diff --git a/nselib/dhcp.lua b/nselib/dhcp.lua
index bffa0cae0..ac7949b0d 100644
--- a/nselib/dhcp.lua
+++ b/nselib/dhcp.lua
@@ -22,6 +22,7 @@ local stdnse = require "stdnse"
 local string = require "string"
 local strbuf = require "strbuf"
 local table = require "table"
+local tableaux = require "tableaux"
 _ENV = stdnse.module("dhcp", stdnse.seeall)
 
 
@@ -37,16 +38,7 @@ request_types =
   DHCPINFORM   = 8
 }
 
---Invert a one-to-one mapping
-local function invert(t)
-  local out = {}
-  for k, v in pairs(t) do
-    out[v] = k
-  end
-  return out
-end
-
-request_types_str = invert(request_types)
+request_types_str = tableaux.invert(request_types)
 
 ---Read an IP address or a list of IP addresses. Print an error if the length isn't a multiple of 4.
 --
diff --git a/nselib/http.lua b/nselib/http.lua
index ed807659e..2dba6a491 100644
--- a/nselib/http.lua
+++ b/nselib/http.lua
@@ -122,6 +122,7 @@ local slaxml = require "slaxml"
 local stdnse = require "stdnse"
 local string = require "string"
 local table = require "table"
+local tableaux = require "tableaux"
 local url = require "url"
 local smbauth = require "smbauth"
 local unicode = require "unicode"
@@ -135,20 +136,6 @@ USER_AGENT = stdnse.get_script_args('http.useragent') or "Mozilla/5.0 (compatibl
 local host_header = stdnse.get_script_args('http.host')
 local MAX_REDIRECT_COUNT = 5
 
--- Recursively copy a table.
--- Only recurs when a value is a table, other values are copied by assignment.
-local function tcopy (t)
-  local tc = {};
-  for k,v in pairs(t) do
-    if type(v) == "table" then
-      tc[k] = tcopy(v);
-    else
-      tc[k] = v;
-    end
-  end
-  return tc;
-end
-
 --- Recursively copy into a table any elements from another table whose key it
 -- doesn't have.
 local function table_augment(to, from)
@@ -881,8 +868,8 @@ local function getPipelineMax(response)
   if response then
     local hdr = response.header or {}
     local opts = stdnse.strsplit("%s+", (hdr.connection or ""):lower())
-    if stdnse.contains(opts, "close") then return 1 end
-    if response.version >= "1.1" or stdnse.contains(opts, "keep-alive") then
+    if tableaux.contains(opts, "close") then return 1 end
+    if response.version >= "1.1" or tableaux.contains(opts, "keep-alive") then
       return tonumber((hdr["keep-alive"] or ""):match("max=(%d+)")) or 40
     end
   end
@@ -992,7 +979,7 @@ local function lookup_cache (method, host, port, path, options)
     else
       mutex "done";
       record.last_used = os.time();
-      return tcopy(record.result), state;
+      return tableaux.tcopy(record.result), state;
     end
   end
 end
@@ -1035,7 +1022,7 @@ local function insert_cache (state, response)
     cache[key] = state.old_record;
   else
     local record = {
-      result = tcopy(response),
+      result = tableaux.tcopy(response),
       last_used = os.time(),
       method = state.method,
       size = type(response.body) == "string" and #response.body or 0,
@@ -1288,7 +1275,7 @@ function generic_request(host, port, method, path, options)
   if digest_auth and have_ssl then
     -- If we want to do digest authentication, we have to make an initial
     -- request to get realm, nonce and other fields.
-    local options_with_auth_removed = tcopy(options)
+    local options_with_auth_removed = tableaux.tcopy(options)
     options_with_auth_removed["auth"] = nil
     local r = generic_request(host, port, method, path, options_with_auth_removed)
     local h = r.header['www-authenticate']
@@ -1304,7 +1291,7 @@ function generic_request(host, port, method, path, options)
 
   if ntlm_auth and have_ssl then
 
-    local custom_options = tcopy(options) -- to be sent with the type 1 request
+    local custom_options = tableaux.tcopy(options) -- to be sent with the type 1 request
     custom_options["auth"] = nil -- removing the auth options
     -- let's check if the target supports ntlm with a simple get request.
     -- Setting a timeout here other than nil messes up the authentication if this is the first device sending
diff --git a/nselib/shortport.lua b/nselib/shortport.lua
index 5da0ca101..36ba34e11 100644
--- a/nselib/shortport.lua
+++ b/nselib/shortport.lua
@@ -8,24 +8,11 @@
 
 local nmap = require "nmap"
 local stdnse = require "stdnse"
+local tableaux = require "tableaux"
 local comm
 _ENV = stdnse.module("shortport", stdnse.seeall)
 
----
--- See if a table contains a value.
--- @param t A table representing a set.
--- @param value The value to check for.
--- @return True if <code>t</code> contains <code>value</code>, false otherwise.
-local function includes(t, value)
-  for _, elem in ipairs(t) do
-    if elem == value then
-      return true
-    end
-  end
-  return false
-end
-
--- Just like includes, but can match simple port ranges
+-- Just like tableaux.contains, but can match simple port ranges
 local function port_includes(t, value)
   for _, elem in ipairs(t) do
     if elem == value then
@@ -84,8 +71,8 @@ portnumber = function(ports, protos, states)
 
   return function(host, port)
     return port_includes(ports, port.number)
-      and includes(protos, port.protocol)
-      and includes(states, port.state)
+      and tableaux.contains(protos, port.protocol, true)
+      and tableaux.contains(states, port.state, true)
   end
 end
 
@@ -120,9 +107,9 @@ service = function(services, protos, states)
   end
 
   return function(host, port)
-    return includes(services, port.service)
-    and includes(protos, port.protocol)
-    and includes(states, port.state)
+    return tableaux.contains(services, port.service, true)
+    and tableaux.contains(protos, port.protocol, true)
+    and tableaux.contains(states, port.state, true)
   end
 end
 
diff --git a/nselib/smb2.lua b/nselib/smb2.lua
index 369d676a2..e84534b58 100644
--- a/nselib/smb2.lua
+++ b/nselib/smb2.lua
@@ -16,6 +16,7 @@ local string = require "string"
 local stdnse = require "stdnse"
 local nmap = require "nmap"
 local table = require "table"
+local tableaux = require "tableaux"
 local match = require "match"
 
 _ENV = stdnse.module("smb2", stdnse.seeall)
@@ -252,7 +253,7 @@ function negotiate_v2(smb, overrides)
   )
 
   -- The next block gets interpreted in different ways depending on the dialect
-  if stdnse.contains(overrides['Dialects'], 0x0311) then
+  if tableaux.contains(overrides['Dialects'], 0x0311) then
     is_0311 = true
   end
 
diff --git a/nselib/sslcert.lua b/nselib/sslcert.lua
index 4a2e4aa3d..c6873c285 100644
--- a/nselib/sslcert.lua
+++ b/nselib/sslcert.lua
@@ -32,6 +32,7 @@ local smtp = require "smtp"
 local stdnse = require "stdnse"
 local string = require "string"
 local table = require "table"
+local tableaux = require "tableaux"
 local tls = require "tls"
 local vnc = require "vnc"
 local xmpp = require "xmpp"
@@ -637,7 +638,7 @@ StartTLS = {
       }
       local best
       for i=1, #auth_order do
-        if stdnse.contains(v.vencrypt.types, auth_order[i]) then
+        if tableaux.contains(v.vencrypt.types, auth_order[i]) then
           best = auth_order[i]
           break
         end
diff --git a/nselib/sslv2.lua b/nselib/sslv2.lua
index 2040aad38..31190bc48 100644
--- a/nselib/sslv2.lua
+++ b/nselib/sslv2.lua
@@ -7,6 +7,7 @@
 
 local stdnse = require "stdnse"
 local table = require "table"
+local tableaux = require "tableaux"
 local nmap = require "nmap"
 local sslcert = require "sslcert"
 local string = require "string"
@@ -333,7 +334,7 @@ function test_sslv2 (host, port)
 
   socket:set_timeout(timeout)
 
-  local ssl_v2_hello = client_hello(stdnse.keys(SSL_CIPHER_CODES))
+  local ssl_v2_hello = client_hello(tableaux.keys(SSL_CIPHER_CODES))
 
   socket:send(ssl_v2_hello)
 
diff --git a/nselib/stdnse.lua b/nselib/stdnse.lua
index e8f5fc2d1..73670bd58 100644
--- a/nselib/stdnse.lua
+++ b/nselib/stdnse.lua
@@ -1106,20 +1106,6 @@ function filename_escape(s)
   end
 end
 
---- Check for the presence of a value in a table
---@param tab the table to search into
---@param item the searched value
---@return Boolean true if the item was found, false if not
---@return The index or key where the value was found, or nil
-function contains(tab, item)
-  for k, val in pairs(tab) do
-    if val == item then
-      return true, k
-    end
-  end
-  return false, nil
-end
-
 --- Returns a conservative timeout for a host
 --
 -- If the host parameter is a NSE host table with a <code>times.timeout</code>
@@ -1156,19 +1142,6 @@ function get_timeout(host, max_timeout, min_timeout)
   return t
 end
 
---- Returns the keys of a table as an array
--- @param t The table
--- @return A table of keys
-function keys(t)
-  local ret = {}
-  local k, v = next(t)
-  while k do
-    ret[#ret+1] = k
-    k, v = next(t, k)
-  end
-  return ret
-end
-
 -- Returns the case insensitive pattern of given parameter
 -- Useful while doing case insensitive pattern match using string library.
 -- https://stackoverflow.com/questions/11401890/case-insensitive-lua-pattern-matching/11402486#11402486
diff --git a/nselib/tableaux.lua b/nselib/tableaux.lua
new file mode 100644
index 000000000..59fd7d40e
--- /dev/null
+++ b/nselib/tableaux.lua
@@ -0,0 +1,91 @@
+--- Auxiliary functions for table manipulation
+--
+-- @author Daniel Miller
+-- @copyright Same as Nmap--See https://nmap.org/book/man-legal.html
+-- @class module
+-- @name tableaux
+
+local next = next
+local pairs = pairs
+local ipairs = ipairs
+local type = type
+local _ENV = {}
+
+local tcopy_local
+--- Recursively copy a table.
+--
+-- Uses simple assignment to copy keys and values from a table, recursing into
+-- subtables as necessary.
+-- @param t the table to copy
+-- @return a deep copy of the table
+function tcopy (t)
+  local tc = {};
+  for k,v in pairs(t) do
+    if type(v) == "table" then
+      tc[k] = tcopy_local(v);
+    else
+      tc[k] = v;
+    end
+  end
+  return tc;
+end
+tcopy_local = tcopy
+
+--- Copy one level of a table.
+--
+-- Iterates over the keys of a table and copies their values into a new table.
+-- If any values are tables, they are copied by reference only, and modifying
+-- the copy will modify the original table value as well.
+-- @param t the table to copy
+-- @return a shallow copy of the table
+function shallow_tcopy(t)
+  local k = next(t)
+  local out = {}
+  while k do
+    out[k] = t[k]
+    k = next(t, k)
+  end
+  return out
+end
+
+--- Invert a one-to-one mapping
+-- @param t the table to invert
+-- @return an inverted mapping
+function invert(t)
+  local out = {}
+  for k, v in pairs(t) do
+    out[v] = k
+  end
+  return out
+end
+
+--- Check for the presence of a value in a table
+--@param t the table to search into
+--@param item the searched value
+--@array (optional) If true, then use ipairs to only search the array indices of the table.
+--@return Boolean true if the item was found, false if not
+--@return The index or key where the value was found, or nil
+function contains(t, item, array)
+  local iter = array and ipairs or pairs
+  for k, val in iter(t) do
+    if val == item then
+      return true, k
+    end
+  end
+  return false, nil
+end
+
+--- Returns the keys of a table as an array
+-- @param t The table
+-- @return A table of keys
+function keys(t)
+  local ret = {}
+  local k, v = next(t)
+  while k do
+    ret[#ret+1] = k
+    k, v = next(t, k)
+  end
+  return ret
+end
+
+return _ENV
diff --git a/nselib/tls.lua b/nselib/tls.lua
index 1f4b0a7e5..9c0124272 100644
--- a/nselib/tls.lua
+++ b/nselib/tls.lua
@@ -14,6 +14,7 @@ local string = require "string"
 local math = require "math"
 local os = require "os"
 local table = require "table"
+local tableaux = require "tableaux"
 local rand = require "rand"
 _ENV = stdnse.module("tls", stdnse.seeall)
 
@@ -676,15 +677,8 @@ DEFAULT_CIPHERS = {
 }
 
 local function find_key(t, value)
-  local k, v
-
-  for k, v in pairs(t) do
-    if v == value then
-      return k
-    end
-  end
-
-  return nil
+  local found, v = tableaux.contains(t, value)
+  return v
 end
 
 -- Keep this local to enforce use of the cipher_info function
diff --git a/nselib/unicode.lua b/nselib/unicode.lua
index f20894fe4..0bab5067e 100644
--- a/nselib/unicode.lua
+++ b/nselib/unicode.lua
@@ -9,6 +9,7 @@ local string = require "string"
 local table = require "table"
 local stdnse = require "stdnse"
 local unittest = require "unittest"
+local tableaux = require "tableaux"
 _ENV = stdnse.module("unicode", stdnse.seeall)
 
 -- Localize a few functions for a tiny speed boost, since these will be looped
@@ -291,15 +292,6 @@ function utf8_dec(buf, pos)
   return pos + 1 + n, cp
 end
 
---Invert a one-to-one mapping
-local function invert(t)
-  local out = {}
-  for k, v in pairs(t) do
-    out[v] = k
-  end
-  return out
-end
-
 -- Code Page 437, native US-English Windows OEM code page
 local cp437_decode = {
   [0x80] = 0x00c7,
@@ -431,7 +423,7 @@ local cp437_decode = {
   [0xfe] = 0x25a0,
   [0xff] = 0x00a0,
 }
-local cp437_encode = invert(cp437_decode)
+local cp437_encode = tableaux.invert(cp437_decode)
 
 ---Encode a Unicode code point to CP437
 --
diff --git a/nselib/url.lua b/nselib/url.lua
index 9f8bb181b..00dbe3aca 100644
--- a/nselib/url.lua
+++ b/nselib/url.lua
@@ -37,6 +37,7 @@ local stdnse = require "stdnse"
 local string = require "string"
 local table = require "table"
 local idna = require "idna"
+local tableaux = require "tableaux"
 local unicode = require "unicode"
 local unittest = require "unittest"
 local base = _G
@@ -419,15 +420,7 @@ function get_default_port (scheme)
   return get_default_port_ports[(scheme or ""):lower()]
 end
 
-local function invert(t)
-  local out = {}
-  for k, v in pairs(t) do
-    out[v] = k
-  end
-  return out
-end
-
-get_default_scheme_schemes = invert(get_default_port_ports)
+get_default_scheme_schemes = tableaux.invert(get_default_port_ports)
 
 ---
 -- Provides the default URI scheme for a given port.
diff --git a/nselib/vnc.lua b/nselib/vnc.lua
index a4cf19e27..7b35bf563 100644
--- a/nselib/vnc.lua
+++ b/nselib/vnc.lua
@@ -30,6 +30,7 @@ local nmap = require "nmap"
 local stdnse = require "stdnse"
 local string = require "string"
 local table = require "table"
+local tableaux = require "tableaux"
 _ENV = stdnse.module("vnc", stdnse.seeall)
 
 local HAVE_SSL, openssl = pcall(require,'openssl')
@@ -72,7 +73,7 @@ end
 
 local function first_of (list, lookup)
   for i=1, #list do
-    if stdnse.contains(lookup, list[i]) then
+    if tableaux.contains(lookup, list[i]) then
       return list[i]
     end
   end
diff --git a/scripts/ajp-methods.nse b/scripts/ajp-methods.nse
index a65445957..703c32921 100644
--- a/scripts/ajp-methods.nse
+++ b/scripts/ajp-methods.nse
@@ -2,6 +2,7 @@ local ajp = require "ajp"
 local shortport = require "shortport"
 local stdnse = require "stdnse"
 local table = require "table"
+local tableaux = require "table"
 
 description = [[
 Discovers which options are supported by the AJP (Apache JServ
@@ -44,7 +45,7 @@ local UNINTERESTING_METHODS = { "GET", "HEAD", "POST", "OPTIONS" }
 local function filter_out(t, filter)
   local result = {}
   for _, e in ipairs(t) do
-    if ( not(stdnse.contains(filter, e)) ) then
+    if ( not(tableaux.contains(filter, e)) ) then
       result[#result + 1] = e
     end
   end
diff --git a/scripts/bitcoinrpc-info.nse b/scripts/bitcoinrpc-info.nse
index 325c86344..d83a1393f 100644
--- a/scripts/bitcoinrpc-info.nse
+++ b/scripts/bitcoinrpc-info.nse
@@ -6,6 +6,7 @@ local shortport = require "shortport"
 local stdnse = require "stdnse"
 local string = require "string"
 local table = require "table"
+local tableaux = require "table"
 
 description = [[
 Obtains information from a Bitcoin server by calling <code>getinfo</code> on its JSON-RPC interface.
@@ -124,7 +125,7 @@ end
 
 local function formatpairs(info)
   local result = stdnse.output_table()
-  local keys = stdnse.keys(info)
+  local keys = tableaux.keys(info)
   table.sort(keys)
   for _, k in ipairs(keys) do
     if info[k] ~= "" then
diff --git a/scripts/dns-nsec-enum.nse b/scripts/dns-nsec-enum.nse
index 2ef34ecf0..36ce39b28 100644
--- a/scripts/dns-nsec-enum.nse
+++ b/scripts/dns-nsec-enum.nse
@@ -4,6 +4,7 @@ local shortport = require "shortport"
 local stdnse = require "stdnse"
 local string = require "string"
 local table = require "table"
+local tableaux = require "tableaux"
 
 description = [[
 Enumerates DNS names using the DNSSEC NSEC-walking technique.
@@ -119,16 +120,6 @@ local function guess_domain(host)
   end
 end
 
-local function invert(t)
-  local result = {}
-
-  for k, v in pairs(t) do
-    result[v] = k
-  end
-
-  return result
-end
-
 -- RFC 952: "A 'name' is a text string up to 24 characters drawn from the
 -- alphabet (A-Z), digits (0-9), minus sign (-), and period (.). ... The first
 -- character must be an alpha character."
@@ -138,7 +129,7 @@ end
 -- RFC 2782: An underscore (_) is prepended to the service identifier to avoid
 -- collisions with DNS labels that occur in nature.
 local DNS_CHARS = { string.byte("-0123456789_abcdefghijklmnopqrstuvwxyz", 1, -1) }
-local DNS_CHARS_INV = invert(DNS_CHARS)
+local DNS_CHARS_INV = tableaux.invert(DNS_CHARS)
 
 -- Return the lexicographically next component, or nil if component is the
 -- lexicographically last.
diff --git a/scripts/dns-nsec3-enum.nse b/scripts/dns-nsec3-enum.nse
index f74ac86fc..a13bc243a 100644
--- a/scripts/dns-nsec3-enum.nse
+++ b/scripts/dns-nsec3-enum.nse
@@ -5,6 +5,7 @@ local base32 = require "base32"
 local nmap = require "nmap"
 local string = require "string"
 local table = require "table"
+local tableaux = require "table"
 local rand = require "rand"
 
 local openssl = stdnse.silent_require "openssl"
@@ -217,7 +218,7 @@ local function query_for_hashes(host,subdomain,domain)
     for _, nsec3 in ipairs(auth_filter(result, "NSEC3")) do
       local h1 = string.lower(remove_suffix(nsec3.dname,domain))
       local h2 = string.lower(nsec3.hash.base32)
-      if not stdnse.contains(all_results,"nexthash " .. h1 .. " " .. h2) then
+      if not tableaux.contains(all_results,"nexthash " .. h1 .. " " .. h2) then
         table.insert(all_results, "nexthash " .. h1 .. " " .. h2)
         stdnse.debug1("nexthash " .. h1 .. " " .. h2)
       end
diff --git a/scripts/duplicates.nse b/scripts/duplicates.nse
index 8c3b9f0d0..fcc4bc098 100644
--- a/scripts/duplicates.nse
+++ b/scripts/duplicates.nse
@@ -3,6 +3,7 @@ local nmap = require "nmap"
 local ssh1 = require "ssh1"
 local stdnse = require "stdnse"
 local table = require "table"
+local tableaux = require "table"
 
 description = [[
 Attempts to discover multihomed systems by analysing and comparing
@@ -68,7 +69,7 @@ local function processSSLCerts(tab)
   for host, v in pairs(tab) do
     for port, sha1 in pairs(v) do
       ssl_certs[sha1] = ssl_certs[sha1] or {}
-      if ( not stdnse.contains(ssl_certs[sha1], host.ip) ) then
+      if ( not tableaux.contains(ssl_certs[sha1], host.ip) ) then
         table.insert(ssl_certs[sha1], host.ip)
       end
     end
@@ -97,7 +98,7 @@ local function processSSHKeys(tab)
         hostkeys[fp] = {}
       end
       -- discard duplicate IPs
-      if not stdnse.contains(hostkeys[fp], ip) then
+      if not tableaux.contains(hostkeys[fp], ip) then
         table.insert(hostkeys[fp], ip)
       end
     end
@@ -121,12 +122,12 @@ local function processNBStat(tab)
   local results, mac_table, name_table = {}, {}, {}
   for host, v in pairs(tab) do
     mac_table[v.mac] = mac_table[v.mac] or {}
-    if ( not(stdnse.contains(mac_table[v.mac], host.ip)) ) then
+    if ( not(tableaux.contains(mac_table[v.mac], host.ip)) ) then
       table.insert(mac_table[v.mac], host.ip)
     end
 
     name_table[v.server_name] = name_table[v.server_name] or {}
-    if ( not(stdnse.contains(name_table[v.server_name], host.ip)) ) then
+    if ( not(tableaux.contains(name_table[v.server_name], host.ip)) ) then
       table.insert(name_table[v.server_name], host.ip)
     end
   end
@@ -157,7 +158,7 @@ local function processMAC(tab)
     if ( host.mac_addr ) then
       mac = stdnse.format_mac(host.mac_addr)
       mac_table[mac] = mac_table[mac] or {}
-      if ( not(stdnse.contains(mac_table[mac], host.ip)) ) then
+      if ( not(tableaux.contains(mac_table[mac], host.ip)) ) then
         table.insert(mac_table[mac], host.ip)
       end
     end
diff --git a/scripts/fcrdns.nse b/scripts/fcrdns.nse
index 0edb7c4d9..f94957e8c 100644
--- a/scripts/fcrdns.nse
+++ b/scripts/fcrdns.nse
@@ -4,6 +4,7 @@ local nmap = require "nmap"
 local stdnse = require "stdnse"
 local string = require "string"
 local table = require "table"
+local tableaux = require "table"
 
 description = [[
 Performs a Forward-confirmed Reverse DNS lookup and reports anomalous results.
@@ -127,7 +128,7 @@ action = function(host)
     str_out = nil
   elseif str_out == nil then
     -- we failed, and need to format a short output string
-    fail_addrs = stdnse.keys(fail_addrs)
+    fail_addrs = tableaux.keys(fail_addrs)
     if #fail_addrs > 0 then
       table.sort(fail_addrs)
       str_out = string.format("FAIL (%s)", table.concat(fail_addrs, ", "))
diff --git a/scripts/fingerprint-strings.nse b/scripts/fingerprint-strings.nse
index a1bd3496d..adc8c41a0 100644
--- a/scripts/fingerprint-strings.nse
+++ b/scripts/fingerprint-strings.nse
@@ -3,6 +3,7 @@ local nmap = require "nmap"
 local lpeg = require "lpeg"
 local U = require "lpeg-utility"
 local table = require "table"
+local tableaux = require "table"
 
 description = [[
 Prints the readable strings from service fingerprints of unknown services.
@@ -87,7 +88,7 @@ action = function(host, port)
   -- Get the table of probe responses
   local responses = U.parse_fp(port.version.service_fp)
   -- extract the probe names
-  local probes = stdnse.keys(responses)
+  local probes = tableaux.keys(responses)
   -- If there were no probes (WEIRD!) we're done.
   if #probes <= 0 then
     return nil
diff --git a/scripts/hostmap-crtsh.nse b/scripts/hostmap-crtsh.nse
index 36978970e..d10ef92fb 100644
--- a/scripts/hostmap-crtsh.nse
+++ b/scripts/hostmap-crtsh.nse
@@ -50,6 +50,7 @@ local stdnse = require "stdnse"
 local string = require "string"
 local target = require "target"
 local table = require "table"
+local tableaux = require "table"
 
 -- Different from stdnse.get_hostname
 -- this function returns nil if the host is only known by IP address
@@ -69,7 +70,7 @@ local function query_ctlogs(host)
     return string.format("Error: could not GET http://%s%s", "crt.sh", query)
   end
   for domain in string.gmatch(response.body, "name_value\":\"(.-)\"") do
-    if not stdnse.contains(hostnames, domain) and domain ~= "" then
+    if not tableaux.contains(hostnames, domain) and domain ~= "" then
       if target.ALLOW_NEW_TARGETS then
         local status, err = target.add(domain)
       end
diff --git a/scripts/http-affiliate-id.nse b/scripts/http-affiliate-id.nse
index 4e5b36c7f..0f41ce1a2 100644
--- a/scripts/http-affiliate-id.nse
+++ b/scripts/http-affiliate-id.nse
@@ -4,6 +4,7 @@ local re = require "re"
 local shortport = require "shortport"
 local stdnse = require "stdnse"
 local table = require "table"
+local tableaux = require "table"
 
 description = [[
 Grabs affiliate network IDs (e.g. Google AdSense or Analytics, Amazon
@@ -133,7 +134,7 @@ local function postaction()
         siteids[id] = {}
       end
       -- discard duplicate IPs
-      if not stdnse.contains(siteids[id], site) then
+      if not tableaux.contains(siteids[id], site) then
         table.insert(siteids[id], site)
       end
     end
diff --git a/scripts/http-cross-domain-policy.nse b/scripts/http-cross-domain-policy.nse
index c28a243df..8a9deac2c 100644
--- a/scripts/http-cross-domain-policy.nse
+++ b/scripts/http-cross-domain-policy.nse
@@ -4,6 +4,7 @@ local vulns = require "vulns"
 local nmap = require "nmap"
 local shortport = require "shortport"
 local table = require "table"
+local tableaux = require "table"
 local string = require "string"
 local slaxml = require "slaxml"
 
@@ -156,7 +157,7 @@ local tlds_instantdomainsearch = {".com", ".net", ".org", ".co", ".info", ".biz"
 ---
 local function check_domain (domain)
   local name, tld = domain:match("(%w*)%.*(%w*%.%w+)$")
-  if not(stdnse.contains(tlds_instantdomainsearch, tld)) then
+  if not(tableaux.contains(tlds_instantdomainsearch, tld)) then
     stdnse.debug(1, "TLD '%s' is not supported by instantdomainsearch.com. Check manually.", tld)
     return nil
   end
@@ -227,11 +228,11 @@ function check_crossdomain(host, port, lookup)
           if domain ~= nil then
             --Deals with tlds with double extension
             local tld = domain:match("%w*(%.%w*)%.%w+$")
-            if tld ~= nil and not(stdnse.contains(tlds_instantdomainsearch, tld)) then
+            if tld ~= nil and not(tableaux.contains(tlds_instantdomainsearch, tld)) then
               domain = domain:match("%w*%.(.*)$")
             end
             --We add domains only once as they can appear multiple times
-            if not(stdnse.contains(trusted_domains, domain)) then
+            if not(tableaux.contains(trusted_domains, domain)) then
               stdnse.debug(1, "Added trusted domain:%s", domain)
               table.insert(trusted_domains, domain)
               --Lookup domains if script argument is set
@@ -280,7 +281,7 @@ Forgery attacks, and may allow third parties to access sensitive data meant for
   local check, domains, domains_available, content = check_crossdomain(host, port, lookup)
   local mt = {__tostring=function(p) return ("%s:\n      %s"):format(p.name, p.body:gsub("\n", "\n      ")) end}
   if check then
-    if stdnse.contains(domains, "*") or stdnse.contains(domains, "https://") or stdnse.contains(domains, "http://") then
+    if tableaux.contains(domains, "*") or tableaux.contains(domains, "https://") or tableaux.contains(domains, "http://") then
       vuln.state = vulns.STATE.VULN
     else
       vuln.state = vulns.STATE.LIKELY_VULN
diff --git a/scripts/http-form-brute.nse b/scripts/http-form-brute.nse
index 3ea90039c..43645a1e3 100644
--- a/scripts/http-form-brute.nse
+++ b/scripts/http-form-brute.nse
@@ -6,6 +6,7 @@ local shortport = require "shortport"
 local stdnse = require "stdnse"
 local string = require "string"
 local table = require "table"
+local tableaux = require "tableaux"
 local url = require "url"
 local rand = require "rand"
 
@@ -310,20 +311,6 @@ local detect_form = function (host, port, path, hostname)
   return nil, string.format("Unable to detect a login form at path %q", path)
 end
 
--- Recursively copy a table.
--- Only recurs when a value is a table, other values are copied by assignment.
-local function tcopy (t)
-  local tc = {};
-  for k,v in pairs(t) do
-    if type(v) == "table" then
-      tc[k] = tcopy(v);
-    else
-      tc[k] = v;
-    end
-  end
-  return tc;
-end
-
 -- TODO: expire cookies
 local function update_cookies (old, new)
   for i, c in ipairs(new) do
@@ -398,9 +385,9 @@ Driver = {
     if not thread then
       thread = {
         -- copy of form fields so we don't clobber another thread's passvar
-        params = tcopy(self.options.formfields),
+        params = tableaux.tcopy(self.options.formfields),
         -- copy of options so we don't clobber another thread's cookies
-        opts = tcopy(self.options.http_options),
+        opts = tableaux.tcopy(self.options.http_options),
       }
       self.options.threads[tid] = thread
     end
diff --git a/scripts/http-grep.nse b/scripts/http-grep.nse
index 84cb2308d..350f7c3b1 100644
--- a/scripts/http-grep.nse
+++ b/scripts/http-grep.nse
@@ -3,6 +3,7 @@ local httpspider = require "httpspider"
 local shortport = require "shortport"
 local stdnse = require "stdnse"
 local table = require "table"
+local tableaux = require "table"
 
 
 description = [[
@@ -304,7 +305,7 @@ action = function(host, port)
           count = count + pattern_count
           for match in body:gmatch(pattern) do
             local validate = BUILT_IN_PATTERNS[pattern_name]and BUILT_IN_PATTERNS[pattern_name]['validate'] or default
-            if validate(match) and not stdnse.contains(all_match, match) then
+            if validate(match) and not tableaux.contains(all_match, match) then
               table.insert(pattern_type, "+ " .. shortenMatch(match))
               table.insert(all_match, match)
             else
diff --git a/scripts/http-methods.nse b/scripts/http-methods.nse
index 6abb57575..55bd679ee 100644
--- a/scripts/http-methods.nse
+++ b/scripts/http-methods.nse
@@ -4,6 +4,7 @@ local shortport = require "shortport"
 local stdnse = require "stdnse"
 local string = require "string"
 local table = require "table"
+local tableaux = require "table"
 local rand = require "rand"
 
 description = [[
@@ -80,7 +81,7 @@ local function filter_out(t, filter)
   local result = {}
   local _, e, f
   for _, e in ipairs(t) do
-    if not stdnse.contains(filter, e) then
+    if not tableaux.contains(filter, e) then
       result[#result + 1] = e
     end
   end
@@ -159,14 +160,14 @@ action = function(host, port)
   local status_lines = {}
 
   for _, method in pairs(SAFE_METHODS) do
-    if not stdnse.contains(methods, method) then
+    if not tableaux.contains(methods, method) then
       table.insert(to_test, method)
     end
   end
 
   if test_all_unsafe then
     for _, method in pairs(UNSAFE_METHODS) do
-      if not stdnse.contains(methods, method) then
+      if not tableaux.contains(methods, method) then
         table.insert(to_test, method)
       end
     end
@@ -212,7 +213,7 @@ action = function(host, port)
       if method == "OPTIONS" then
         -- Use the saved value.
         str = options_status_line
-      elseif stdnse.contains(to_test, method) then
+      elseif tableaux.contains(to_test, method) then
         -- use the value saved earlier.
         str = status_lines[method]
       -- this case arises when methods in the Public or Allow headers are retested.
diff --git a/scripts/http-rfi-spider.nse b/scripts/http-rfi-spider.nse
index 250667063..1d0504902 100644
--- a/scripts/http-rfi-spider.nse
+++ b/scripts/http-rfi-spider.nse
@@ -75,6 +75,7 @@ local url = require 'url'
 local httpspider = require 'httpspider'
 local string = require 'string'
 local table = require 'table'
+local tableaux = require 'tableaux'
 
 -- this is a variable that will hold the function that checks if a pattern we are searching for is in
 -- response's body
@@ -176,17 +177,6 @@ local function check_responses(urls, responses)
   return suspects
 end
 
--- return a shallow copy of t
-local function tcopy(t)
-  local k = next(t)
-  local out = {}
-  while k do
-    out[k] = t[k]
-    k = next(t, k)
-  end
-  return out
-end
-
 portrule = shortport.port_or_service( {80, 443}, {"http", "https"}, "tcp", "open")
 
 function action(host, port)
@@ -268,7 +258,7 @@ function action(host, port)
     local rfi = { name = "Possible RFI in form fields" }
     for path, forms in pairs(output.Forms) do
       for fid, fobj in pairs(forms) do
-        local out = tcopy(fobj["Vulnerable fields"])
+        local out = tableaux.shallow_tcopy(fobj["Vulnerable fields"])
         out.name = string.format('Form "%s" at %s (action %s) with fields:',
                                  fid, path, fobj["Action"])
         table.insert(rfi, out)
@@ -279,7 +269,7 @@ function action(host, port)
   if #output.Queries > 0 then
     local rfi = { name = "Possible RFI in query parameters" }
     for path, queries in pairs(output.Queries) do
-      local out = tcopy(queries)
+      local out = tableaux.shallow_tcopy(queries)
       out.name = string.format('Path %s with queries:', path)
       table.insert(rfi, out)
     end
diff --git a/scripts/http-webdav-scan.nse b/scripts/http-webdav-scan.nse
index 2757fea30..75d056103 100644
--- a/scripts/http-webdav-scan.nse
+++ b/scripts/http-webdav-scan.nse
@@ -1,6 +1,7 @@
 local http = require "http"
 local ipOps = require "ipOps"
 local table = require "table"
+local tableaux = require "table"
 local shortport = require "shortport"
 local stdnse = require "stdnse"
 
@@ -108,7 +109,7 @@ local function getIPs(body)
       end
     end
   end
-  return stdnse.keys(result)
+  return tableaux.keys(result)
 end
 
 -- a function to test the PROPFIND method.
diff --git a/scripts/ms-sql-tables.nse b/scripts/ms-sql-tables.nse
index 2a775efdc..cb2f08f7c 100644
--- a/scripts/ms-sql-tables.nse
+++ b/scripts/ms-sql-tables.nse
@@ -2,6 +2,7 @@ local mssql = require "mssql"
 local stdnse = require "stdnse"
 local string = require "string"
 local table = require "table"
+local tableaux = require "table"
 
 -- -*- mode: lua -*-
 -- vim: set filetype=lua :
@@ -177,7 +178,7 @@ local function process_instance( instance )
         end
 
         for k, v in pairs(dbs.rows) do
-          if ( not( stdnse.contains( done_dbs, v[1] ) ) ) then
+          if ( not( tableaux.contains( done_dbs, v[1] ) ) ) then
             local query = [[ SELECT so.name 'table', sc.name 'column', st.name 'type', sc.length
               FROM %s..syscolumns sc, %s..sysobjects so, %s..systypes st
               WHERE so.id = sc.id AND sc.xtype=st.xtype AND
diff --git a/scripts/nbd-info.nse b/scripts/nbd-info.nse
index dfc505043..60a9aa99c 100644
--- a/scripts/nbd-info.nse
+++ b/scripts/nbd-info.nse
@@ -2,6 +2,7 @@ local nbd = require "nbd"
 local shortport = require "shortport"
 local stdnse = require "stdnse"
 local table = require "table"
+local tableaux = require "table"
 
 description = [[
 Displays protocol and block device information from NBD servers.
@@ -160,7 +161,7 @@ action = function(host, port)
   -- Format exported block device information.
   local exports = stdnse.output_table()
   local no_shares = true
-  local names = stdnse.keys(comm.exports)
+  local names = tableaux.keys(comm.exports)
   -- keep exports in stable order
   table.sort(names)
   for _, name in ipairs(names) do
diff --git a/scripts/reverse-index.nse b/scripts/reverse-index.nse
index 269d0a0f7..715d0bfb3 100644
--- a/scripts/reverse-index.nse
+++ b/scripts/reverse-index.nse
@@ -2,6 +2,7 @@ local ipOps = require "ipOps"
 local nmap = require "nmap"
 local stdnse = require "stdnse"
 local table = require "table"
+local tableaux = require "table"
 
 description = [[
 Creates a reverse index at the end of scan output showing which hosts run a
@@ -101,7 +102,7 @@ postaction = function()
 
   local results = stdnse.output_table()
   for proto, ports in pairs(db) do
-    local portnumbers = stdnse.keys(ports)
+    local portnumbers = tableaux.keys(ports)
     table.sort(portnumbers)
     for _, port in ipairs(portnumbers) do
       local result_entries = ports[port]
diff --git a/scripts/smb-enum-groups.nse b/scripts/smb-enum-groups.nse
index 78beec6ba..fd491960c 100644
--- a/scripts/smb-enum-groups.nse
+++ b/scripts/smb-enum-groups.nse
@@ -3,6 +3,7 @@ local smb = require "smb"
 local stdnse = require "stdnse"
 local string = require "string"
 local table = require "table"
+local tableaux = require "table"
 
 description = [[
 Obtains a list of groups from the remote Windows system, as well as a list of the group's users.
@@ -148,14 +149,14 @@ action = function(host)
   local response = stdnse.output_table()
   local response_str = {}
 
-  local domains = stdnse.keys(groups)
+  local domains = tableaux.keys(groups)
   table.sort(domains)
   for _, domain_name in ipairs(domains) do
     local dom_groups = stdnse.output_table()
     response[domain_name] = dom_groups
     local domain_data = groups[domain_name]
 
-    local rids = stdnse.keys(domain_data)
+    local rids = tableaux.keys(domain_data)
     table.sort(rids)
     for _, rid in ipairs(rids) do
       local group_data = domain_data[rid]
diff --git a/scripts/ssh-hostkey.nse b/scripts/ssh-hostkey.nse
index dbf33647f..873abbaf2 100644
--- a/scripts/ssh-hostkey.nse
+++ b/scripts/ssh-hostkey.nse
@@ -6,6 +6,7 @@ local ssh2 = require "ssh2"
 local stdnse = require "stdnse"
 local string = require "string"
 local table = require "table"
+local tableaux = require "table"
 local base64 = require "base64"
 local comm = require "comm"
 
@@ -189,7 +190,7 @@ local function check_keys(host, keys, f)
           end
         end
       else
-        if stdnse.contains(possible_host_names, parts[1]) then
+        if tableaux.contains(possible_host_names, parts[1]) then
           stdnse.debug2("Found an entry that matches: %s", parts[1])
           table.insert(keys_from_file, ("%s %s"):format(parts[2], parts[3]))
         else
@@ -367,7 +368,7 @@ local function postaction()
         }
       end
       -- discard duplicate IPs
-      if not stdnse.contains(hostkeys[fp], ip) then
+      if not tableaux.contains(hostkeys[fp], ip) then
         table.insert(hostkeys[fp], ip)
       end
     end
diff --git a/scripts/ssl-ccs-injection.nse b/scripts/ssl-ccs-injection.nse
index a1fa03ee9..4be7d50dd 100644
--- a/scripts/ssl-ccs-injection.nse
+++ b/scripts/ssl-ccs-injection.nse
@@ -4,6 +4,7 @@ local sslcert = require('sslcert')
 local stdnse = require('stdnse')
 local vulns = require('vulns')
 local tls = require 'tls'
+local tableaux = require "table"
 
 description = [[
 Detects whether a server is vulnerable to the SSL/TLS "CCS Injection"
@@ -143,7 +144,7 @@ local function test_ccs_injection(host, port, version)
       ["record_protocol"] = (version == "SSLv3") and "SSLv3" or "TLSv1.0",
       -- Claim to support every cipher
       -- Doesn't work with IIS, but IIS isn't vulnerable
-      ["ciphers"] = stdnse.keys(tls.CIPHERS),
+      ["ciphers"] = tableaux.keys(tls.CIPHERS),
       ["compressors"] = {"NULL"},
       ["extensions"] = {
         -- Claim to support common elliptic curves
diff --git a/scripts/ssl-heartbleed.nse b/scripts/ssl-heartbleed.nse
index ce3deab57..586268f9c 100644
--- a/scripts/ssl-heartbleed.nse
+++ b/scripts/ssl-heartbleed.nse
@@ -4,6 +4,7 @@ local shortport = require('shortport')
 local sslcert = require('sslcert')
 local stdnse = require('stdnse')
 local string = require "string"
+local tableaux = require "table"
 local vulns = require('vulns')
 local have_tls, tls = pcall(require,'tls')
 assert(have_tls, "This script requires the tls.lua library from https://nmap.org/nsedoc/lib/tls.html")
@@ -73,7 +74,7 @@ local function testversion(host, port, version)
       ["protocol"] = version,
       -- Claim to support every cipher
       -- Doesn't work with IIS, but IIS isn't vulnerable
-      ["ciphers"] = stdnse.keys(tls.CIPHERS),
+      ["ciphers"] = tableaux.keys(tls.CIPHERS),
       ["compressors"] = {"NULL"},
       ["extensions"] = {
         -- Claim to support common elliptic curves
diff --git a/scripts/ssl-poodle.nse b/scripts/ssl-poodle.nse
index 4f1c9a878..9b2b12149 100644
--- a/scripts/ssl-poodle.nse
+++ b/scripts/ssl-poodle.nse
@@ -4,6 +4,7 @@ local sslcert = require "sslcert"
 local stdnse = require "stdnse"
 local string = require "string"
 local table = require "table"
+local tableaux = require "tableaux"
 local tls = require "tls"
 local listop = require "listop"
 local vulns = require "vulns"
@@ -61,16 +62,6 @@ dependencies = {"ssl-enum-ciphers", "https-redirect"}
 -- http://seclists.org/nmap-dev/2010/q1/859
 local CHUNK_SIZE = 64
 
-local function keys(t)
-  local ret = {}
-  local k, v = next(t)
-  while k do
-    ret[#ret+1] = k
-    k, v = next(t, k)
-  end
-  return ret
-end
-
 -- Add additional context (protocol) to debug output
 local function ctx_log(level, protocol, fmt, ...)
   return stdnse.print_debug(level, "(%s) " .. fmt, protocol, ...)
@@ -184,20 +175,6 @@ local function base_extensions(host)
   }
 end
 
--- Recursively copy a table.
--- Only recurs when a value is a table, other values are copied by assignment.
-local function tcopy (t)
-  local tc = {};
-  for k,v in pairs(t) do
-    if type(v) == "table" then
-      tc[k] = tcopy(v);
-    else
-      tc[k] = v;
-    end
-  end
-  return tc;
-end
-
 -- Find which ciphers out of group are supported by the server.
 local function find_ciphers_group(host, port, protocol, group)
   local name, protocol_worked, record, results
@@ -305,7 +282,7 @@ local function check_fallback_scsv(host, port, protocol, ciphers)
     ["extensions"] = base_extensions(host),
   }
 
-  t["ciphers"] = tcopy(ciphers)
+  t["ciphers"] = tableaux.tcopy(ciphers)
   t.ciphers[#t.ciphers+1] = "TLS_FALLBACK_SCSV"
 
   -- TODO: remove this check after the next release.
diff --git a/scripts/sslv2-drown.nse b/scripts/sslv2-drown.nse
index cb23f0b89..b725ff476 100644
--- a/scripts/sslv2-drown.nse
+++ b/scripts/sslv2-drown.nse
@@ -1,6 +1,7 @@
 local nmap = require "nmap"
 local shortport = require "shortport"
 local table = require "table"
+local tableaux = require "table"
 local stdnse = require "stdnse"
 local string = require "string"
 local sslcert = require "sslcert"
@@ -132,7 +133,7 @@ local function do_setup(host, port)
     end
   end
   socket:set_timeout(timeout)
-  socket:send(sslv2.client_hello(stdnse.keys(sslv2.SSL_CIPHER_CODES)))
+  socket:send(sslv2.client_hello(tableaux.keys(sslv2.SSL_CIPHER_CODES)))
   local status, buffer = sslv2.record_buffer(socket)
   if not status then
     socket:close()
diff --git a/scripts/targets-ipv6-multicast-mld.nse b/scripts/targets-ipv6-multicast-mld.nse
index 3f127b528..6a48418bf 100644
--- a/scripts/targets-ipv6-multicast-mld.nse
+++ b/scripts/targets-ipv6-multicast-mld.nse
@@ -4,6 +4,7 @@ local nmap = require "nmap"
 local stdnse = require "stdnse"
 local tab = require "tab"
 local table = require "table"
+local tableaux = require "table"
 local target = require "target"
 local multicast = require "multicast"
 
@@ -103,7 +104,7 @@ end
 local function format_output(results)
   local output = tab.new()
   local xmlout = {}
-  local ips = stdnse.keys(results)
+  local ips = tableaux.keys(results)
   table.sort(ips)
 
   for i, ip in ipairs(ips) do
diff --git a/scripts/tls-ticketbleed.nse b/scripts/tls-ticketbleed.nse
index 9d81ef67a..f1188e981 100644
--- a/scripts/tls-ticketbleed.nse
+++ b/scripts/tls-ticketbleed.nse
@@ -4,6 +4,7 @@ local shortport = require("shortport")
 local sslcert = require("sslcert")
 local stdnse = require("stdnse")
 local table = require("table")
+local tableaux = require "table"
 local tls = require "tls"
 local vulns = require("vulns")
 local rand = require "rand"
@@ -213,7 +214,7 @@ local function is_vuln(host, port, version)
     ["session_id"] = sid_old,
     -- Claim to support every cipher
     -- Doesn't work with IIS, but only F5 products should be affected
-    ["ciphers"] = stdnse.keys(tls.CIPHERS),
+    ["ciphers"] = tableaux.keys(tls.CIPHERS),
     ["compressors"] = {"NULL"},
     ["extensions"] = {
       -- Claim to support common elliptic curves
diff --git a/scripts/xmlrpc-methods.nse b/scripts/xmlrpc-methods.nse
index 1640ed078..94c7ac3c5 100644
--- a/scripts/xmlrpc-methods.nse
+++ b/scripts/xmlrpc-methods.nse
@@ -6,6 +6,7 @@ local stdnse = require "stdnse"
 local strbuf = require "strbuf"
 local string = require "string"
 local table = require "table"
+local tableaux = require "table"
 
 description = [[
 Performs XMLRPC Introspection via the system.listMethods method.
@@ -86,7 +87,7 @@ action = function(host, port)
       }
     parser:parseSAX(response.body, {stripWhitespace=true})
 
-    if  nmap.verbosity() > 1 and stdnse.contains(output["Supported Methods"], "system.methodHelp") then
+    if  nmap.verbosity() > 1 and tableaux.contains(output["Supported Methods"], "system.methodHelp") then
       for i, method in ipairs(output["Supported Methods"]) do
         data = '<methodCall> <methodName>system.methodHelp</methodName> <params> <param><value> <string>' .. method .. '</string> </value></param> </params> </methodCall>'
         response = http.post(host, port, url, {header = {["Content-Type"] = "application/x-www-form-urlencoded"}}, nil, data)