Problem $1$: $80\%]$ Multiple$-$choice Questions

$1)$ A digital signature can guarantee the integrity but not the source of the message.

A$.$ True

B$.$ False

$2)$ The most important development from the work on public$-$key cryptography is the digital signature.

A$.$ True

B$.$ False

$3)$ The ElGamal signature scheme involves the use of the public key for encryption and the private key

for decryption.

A$.$ True

B$.$ False

$4)$ It is important in a direct digital signature to perform an outer confidentiality function first and then

the signature function.

A$.$ True

B$.$ False

$5)$ Message authentication protects two parties who exchange messages from any third party, however,

it does not protect the two parties against each other.

A$.$ True

B$.$ False

$6)$ It must be relatively difficult to recognize and verify the digital signature.

A$.$ True

B$.$ False

$7)$ The Schnorr signature scheme is based on discrete logarithms.

A$.$ True

B$.$ False

$8)$ The first part of the Schnorr digital signature scheme is the generation of a private$/$public key pair.

A$.$ True

B$.$ False