Q. Hashed message is signed by a sender using?

A
His public key
B
His private key
C
Receiver's private key
D
Receiver's public key
Solution:

In cryptography, an HMAC (sometimes expanded as either keyed-hash message authentication code or hash-based message authentication code) is a specific type of message authentication code (MAC) involving a cryptographic hash function and a secret cryptographic key.

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