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The AuthKey is known as such: When the registrar receives M1 he generates his public key and rnonce and can compute the DHKey = SHA-256(gAB mod p, 192) and subsequently the KDK = HMAC-SHA-256(DHKey, enonce || EnrolleeMAC|| rnonce) Finally the AuthKey is derived as part of AuthKey|| KeyWrapKey|| EMSK = kdf(KDK, “Wi-FiEasy andSecure Key Derivation”, [...

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