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Current Modes of Operation
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FIPS 81,
DES Modes of Operation, December 1980.
FIPS 81 specifies four confidentiality modes of operation for DES
(ECB, CBC, CFB, OFB), which are used by the Triple DES, DES,
and Skipjack algorithms.
SP 800-38A 2001 ED,
Recommendation for Block Cipher Modes of Operation,
December 2001.
In SP 800-38A, five confidentiality modes are specified: the CTR
mode and updated versions of the four DES modes. The modes are approved
for use with any approved block cipher, such as the AES algorithm.
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Development of New Modes of Operation
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NIST will specify additional modes in the SP 800-38 series of special
publications.
NIST expects to publish a 2002 edition of SP 800-38A in which the
domain of the CBC mode is extended (to include plaintexts whose
bit lengths are not a multiple of the block size).
A draft of SP 800-38B,
the second document of the series, is available for public comment.
The draft specifies the RMAC authentication mode, an improved variant
of the CBC-MAC algorithm, for use with any approved block cipher.
Comments on the draft may be submitted to EncryptionModes@nist.gov
until December 2, 2002.
NIST is considering whether to specify other modes. Several proposals
for modes have been submitted to NIST, including modes for authentication,
authenticated encryption, hashing, and random bit generation.
Details are available at the Modes
of Operation Home Page.
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