What is the length of an MD5 message digest?

In a known plaintext attack, the cryptanalyst has knowledge of which of the following?

Which of the following ciphers is a subset on which the Vigenere polyalphabetic cipher was based on?

Which one of the following is a key agreement protocol used to enable two entities to agree and generate a
session key (secret key used for one session) over an insecure medium without any prior secrets or
communications between the entities? The negotiated key will subsequently be used for message encryption
using Symmetric Cryptography.

Which of the following is NOT a true statement regarding the implementation of the 3DES modes?

Which of the following cryptographic attacks describes when the attacker has a copy of the plaintext and the
corresponding ciphertext?

Which of the following is a cryptographic protocol and infrastructure developed to send encrypted credit card
numbers over the Internet?

Which of the following protocols that provide integrity and authentication for IPSec, can also provide nonrepudiation in IPSec?

Which of the following algorithms does NOT provide hashing?

Compared to RSA, which of the following is true of Elliptic Curve Cryptography (ECC)?