Cipher Block Padding - Ciphertext stealing (CTS)


Ciphertext stealing (CTS) is a padding method in which the required padding bits are “stolen” from the penultimate ciphertext block.

It works without padding the message to a multiple of the block size, so the ciphertext is the same size as the plaintext.

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 the last plaintext block.

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Block Cipher - Padding

Padding fill the last block of a file to be processed by a block cipher. For the , , and modes, the plaintext must be a sequence of one or more complete data blocks (or, for CFB mode, data segments)....

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