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NIST Releases Updates for Cryptographic Key-Establishment Recommendations

Posted April 18, 2018
This news or article is intended for readers with certain scientific or professional knowledge in the field.

NIST has updated two publications on cryptographic key-establishment schemes—procedures that result in secret keying material being shared among different parties. The first publication, Special Publication (SP) 800-56A Revision 3, Recommendation for Pair-Wise Key Establishment Schemes Using Discrete Logarithm Cryptography, approves the use of specific safe-prime groups of domain parameters for the finite field Diffie-Hellman (DH) and Menezes-Qu-Vanstone (MQV) key establishment schemes, in addition to the previously approved domain parameter sets.

The second publication, SP 800-56C Revision 1, Recommendation for Key-Derivation Methods in Key-Establishment Schemes, specifies two categories of key-derivation methods that can be used. The first category consists of a family of one-step key-derivation functions, which derive keying material from a shared secret generated during the execution of a key-establishment scheme. The second category consists of two-step key-derivation methods that involve the following two steps: 1) randomness extraction, to obtain a single cryptographic key-derivation key from a shared secret generated during the execution of a key-establishment scheme; and 2) key expansion, to derive keying material from that key-derivation key and other information.

Source: NIST

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