hi, digital signature, use private key to encrypt MAC(message authorization code) ,
in TLS1.2, HAMC is used ,MAC will be encrypted with a key which is created during the handshake. is it necessary to use private key to encrypt the HAMC for non-repudiation? Is the digital signature optional in TLS? i think it is necessary to encrypt HMAC of every record,but I'm not sure about that. thanks in advance!
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