Question

The __________ property is the "one-way" property and is important if the

      authentication technique involves the use of a secret value

The __________ approach has two advantages: it provides a digital signature as well

      as message authentication and it does not require the distribution of keys to

      communicating parties.

Like the MAC, a __________ accepts a variable size message M as input and produces

      a fixed size message digest H(M) as output. Unlike the MAC, it does not take a ______

Answer 1

The preimage resistant property is the "one-way" property and is important if the authentication technique involves the use of a secret value

The public-key approach has two advantages: it provides a digital signature as well as message authentication and it does not require the distribution of keys to communicating parties.

Like the MAC, a hash function accepts a variable size message M as input and produces a fixed size message digest H(M) as output. Unlike the MAC, it does not take a secret key as input.