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HKDF is a key derivation function specified in RFC5869.

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Is it safe to re-use the salt for HKDF as a challenge for proof of possession after key deri...

Then, they use HKDF (rfc5869) based on SHA256 to derive SK: PRK = HMAC-SHA256(salt, MK) // HKDF-Extract T = HMAC-SHA256(PRK, info | 0x01) // HKDF-Expand SK = first 16 octets of T Now, by protocol …
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