Which of the following can be implemented with multiple bit strength?
A.
AES
B.
DES
C.
SHA-1
D.
MD5
E.
MD4
Explanation:
AES (a symmetric algorithm) uses key sizes of 128, 192, or 256 bits.
Incorrect Answers:
B: The Data Encryption Standard (DES) has been used since the mid-1970s. It was the primary standard
used in government and industry until it was replaced by AES. It’s based on a 56-bit key and has several
modes that offer security and integrity.
C: The Secure Hash Algorithm (SHA) was designed to ensure the integrity of a message. SHA is a one-way
hash that provides a hash value that can be used with an encryption protocol. This algorithm produces a
160-bit hash value. SHA-2 has several sizes: 224, 256, 334, and 512 bit.
D: The Message Digest Algorithm (MD) creates a hash value and uses a one-way hash. The hash value is
used to help maintain integrity. There are several versions of MD; the most common are MD5, MD4, and
MD2. MD5 is the newest version of the algorithm. It produces a 128-bit hash, but the algorithm is more
complex than its predecessors and offers greater security.
E: The MD4 Message-Digest Algorithm is a cryptographic hash function developed by Ronald Rivest in
1990. The digest length is 128 bitsDulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, 6th Edition, Sybex, Indianapolis,
2014, pp. 250, 251, 255-256