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What is the difference between KDF based on NIST SP800-108 vs. the older one in ANSI X9.63? When should one be selected over the other? Thanks.

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    $\begingroup$ ANSI X9.63 uses SHA-1, whereas SP800-108 uses PRF based KDF. $\endgroup$ – kelalaka Nov 26 '18 at 19:12
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The ANSI X9.63 uses SHA-1 for Key Derivation Function:

Ingredients: The key derivation function employs the hash function SHA-1 specified in Section 5.6.2

NIST SP800-108 uses PRFs:

This Section defines several families of key derivation functions that use PRFs.

First look at their dates;

  • 1998 : ANSI X9.63
  • 2009 : NIST SP800-108

And, SHA-1 is no longer recomended. So you should prefer NIST SP800-108

There are two other reasons for not to use SHA-1:


Note: Depending on your case, there is also password-based key derivations; as PBKDF2.

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