(A) the clear text transmission of the digital signatureAlgorithm: Hash functions Encryption or signing algorithms Sender: using its own private key to sign digital signature Recipient: uses the sender's public key certificate signature code
(A) expressly transmission of digital signature algorithms: hybrid hash function algorithms encryption algorithms or sign sender: use their private key to sign the digital signature recipient: use the sender's public key authentication signature code
(a) plaintext transmission digital signature algorithm: hash function
encryption algorithm or signing algorithm sender: use their private key signing digital signature the receiver, the sender public key signature and authentication code