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Threat of using previous application traffic secret #83

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tireddy2 opened this issue Dec 5, 2023 · 0 comments

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tireddy2 commented Dec 5, 2023

sk = HKDF-Expand-Label(dh-secret, "DH-derived key", "", Hash.length)

application_traffic_secret_N+1 =
HKDF-Expand-Label(application_traffic_secret_N,
"traffic upd 2", sk, Hash.length)

Assuming the application_traffic_secret_N is already exfiltrated by the attacker, why is the "sk" not used as in PRK input ?

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