!!! Overview
[{$pagename}] in general is substituting a [Sensitive Data] element with a non-sensitive equivalent, referred to as a token which has no meaning or value outside of the current [Context] if the "Tokenized" [data] is [leaked|Data loss][{$pagename}] is used to generate an [Opaque token]!! [EMVCo Tokenization]
The purpose of [{$pagename}] (According to [EMVCo Tokenization]) is to swap out the original [message] with [by-reference] data with no intrinsic value of its own.

From this perspective, this is the same as [by-reference].

[{$pagename}] differs from [encryption] and [Hash Functions] where the [message] is changed, but the original [message] is still within the [Ciphertext]. The [Ciphertext], of course, can be [decrypted|decryption] from:
* using the appropriate key(s)
* [Brute-Force] [Attacks]
* a [Compromised Certificate] or key

[{$pagename}]s, on the other hand, cannot be decrypted because there is no mathematical [relationship] between the [Opaque token] and its original [message]. 

[De-tokenization] is, of course, the reverse process, when the token is swapped for the original [message]. De-tokenization can typically only be done by the original [Tokenization Service] or [Token Service Provider]. There is no other way to obtain the original [message] from just the Tokenized [Token]. 

!! Single use [{$pagename}]s
[by-reference] [Tokens] can be single use (a one time [Debit Card] [transaction]) that are not retained, or multi-use (a [Payment Card] number of a repeat customer) that is stored in a database for recurring transactions.

!! [{$pagename}] Standards[2]
* [ANSI X9.119 Part 2|http://x9.org/wp-content/uploads/2014/01/X9-Tokenization-Webinar-January-2014.pptx|target='_blank'] - Addresses [{$pagename}]
* [EMVCo Tokenization] - [EMV Payment Tokenisation Specification – Technical Framework|https://www.emvco.com/download_agreement.aspx?id=945|target='_blank']

!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
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* [#1] - [WHAT IS TOKENIZATION?|https://tokenex.com/learn/what-is-tokenization|target='_blank'] - based on information obtained 2015-10-04
* [#2] - [Tokenization|https://en.wikipedia.org/wiki/Tokenization_(data_security)|target='_blank'] - based on information obtained 2015-10-04