Recommendation For Block Cipher Modes Of Operation
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Recommendation for Block Cipher Modes of Operation Methods and Techniques
This recommendation defines five confidentiality modes of operation for use with an underlying symmetric key block cipher algorithm: Electronic Codebook (ECB), Cipher Block Chaining (CBC), Cipher Feedback (CFB), Output Feedback (OFB), and Counter (CTR). Used with an underlying block cipher algorithm that is approved in a Federal Information Processing Standard (FIPS), these modes can provide cryptographic protection for sensitive, but unclassified, computer data.
Recommendation for Block Cipher Modes of Operation
A limitation to Cipher Block Chaining (CBC) mode, as specified in NIST Special Publication 800-38A, is that the plaintext input must consist of a sequence of blocks. Ciphertext stealing is a padding method in which the required padding bits are stolen from the penultimate ciphertext block. This addendum to SP 800-38A specifies three variants of CBC mode with ciphertext stealing. These variants, which differ only in the ordering of the ciphertext bits, can encrypt any input whose bit length is greater than or equal to the block size. Unlike conventional padding methods, these variants do not expand the length of the data.
Recommendation for Block Cipher Modes of Operation. Methods and Techniques
This recommendation defines five confidentiality modes of operation for use with an underlying symmetric key block cipher algorithm: Electronic Codebook (ECB), Cipher Block Chaining (CBC), Cipher Feedback (CFB), Output Feedback (OFB), and Counter (CTR). Used with an underlying block cipher algorithm that is approved in a Federal Information Processing Standard (FIPS), these modes can provide cryptographic protection for sensitive, but unclassified, computer data.