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Yes, according to NIST SP 800-56A revision 2, a KDF based on HMAC-SHA-256 is a suitable option. The basic idea behind using a Key Based Key Derivation Function KBKDF is that the output of the the primitive within the key agreement protocol (DH, ECDH) returns enough entropy for a key to be created. However that entropy may still be distinguishable from ...

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