!!! Overview
[{$pagename}] ([CTS]) is a technique for [encrypting|Encryption] [plaintext] using a [Block Cipher], without padding the message to a multiple of the block size, so the ciphertext is the same size as the plaintext.


[{$pagename}] is done by altering processing of the last two [blocks] of the [message]. The processing of all but the last two [blocks] is unchanged, but a portion of the second-last block's [ciphertext] is "stolen" to [pad|Padding bit] the last [plaintext] block. The [Padded] final block is then encrypted as usual.

The final ciphertext, for the last two blocks, consists of the partial penultimate block (with the "stolen" portion omitted) plus the full final block, which are the same size as the original plaintext.

!! More Information
There might be more information for this subject on one of the following:
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* [#1] - [Ciphertext_stealing|Wikipedia:Ciphertext_stealing|target='_blank'] - based on information obtained 2018-05-16-