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DES Modes

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electronic code book (ECB)

cipher block chaining (CBC)

cipher feedback (CFB)

output feedback (OFB)

counter mode

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A DES mode in which each 64-bit block is chained together because each resultant 64-bit ciphertext block is applied to the next block. So plaintext message block 1 is processed by the algorithm using an initialization vector (IV). The resultant ciphertext message block 1 is XORed with plaintext message block 2, resulting in ciphertext message 2. This process continues until the message is complete.

A DES mode similar to OFB mode that uses an incrementing IV counter to ensure that each block is encrypted with a unique keystream. Also, the ciphertext is not chaining into the encryption process. Because this chaining does not occur, CTR performance is much better than the other modes.

A DES mode that works with 8-bit (or smaller) blocks and uses a combination of stream ciphering and block ciphering. As with CBC, the first 8-bit block of the plaintext message is XORed by the algorithm using a keystream, which is the result of an IV and the key. The resultant ciphertext message is applied to the next plaintext message block.

A DES mode that works with 8-bit (or smaller) blocks that uses a combination of stream ciphering and block ciphering. However, it uses the previous keystream with the key to create the next keystream.

A version of DES in which 64-bit blocks of data are processed by the algorithm using the key. The ciphertext produced can be padded to ensure that the result is a 64-bit block.