Using Message$-$by$-$Message Authentication with Digital Signatures, the plaintext is not encrypted when it is sent over the Internet. Only the message digest of the plaintext is encrypted.

Question $4$ options:

True

False

Question $5(2$ points$)$

Listen

The purpose of using Public Key Infrastructures $($PKI$)$ is to distribute users' public keys to the communication parties.

Question $5$ options:

True

False