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WGU C839 Ciphers/21 Questions and Answers
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WGU C839 Ciphers/21 Questions andAnswers
Data Encryption Standard (DES) - -A symmetric block cipher that uses a 56-
bit key and encrypts data in 64-bit blocks. 16 rounds. | Feistel algorithm.
Block cipher. Symmetric.
-Triple Data Encryption Standard (3DES) - -An encryption similar to DES but
uses a key that can be three times the size, at a 168-bit key. 16 rounds. |
Feistel algorithm. Block cipher. Symmetric.
-Advanced Encryption Standard (AES) - -A block cipher created in the late
1990s that uses a 128-bit block size and a 128-, 192-, or 256-bit key size. 10
rounds at 128-bit, 12 at 192, or 14 at 256. | Substitution - Permutation
algorithm, Rijyndael cipher. Block cipher. Symmetric.
-Blowfish - -A block cipher that operates on 64-bit blocks and can have a
key length from 32 to 448 bits. 16 rounds. | Feistel in BCrypt, CrashPlan,
Cryptodisk, DriveCrypt algorithm. Block cipher. Symmetric.
-Twofish - -A block cipher that operates on 128-bit blocks of data and is
capable of using cryptographic keys up to 256 bits in length. 16 rounds. |
Feistel algorithm. Block cipher. Symmetric.
-Skipjack - -Uses an 80-bit key, supports the same four modes of operation
as DES, and operates on 64-bit blocks of text. 32 rounds. | Unbalanced
Feistel algorithm. Block cipher. Symmetric.
-International Data Encryption Algorithm (IDEA) - -Block symmetric cipher
that uses a 128-bit key and 64-bit block size. 8 rounds. | Lai-Massey Scheme
algorithm. Block cipher. Symmetric.
-Carlisle Adams Stafford Tavares (CAST) - -A type of symmetric block cipher
defined by RFC 2144. 128 or 256 bits. 64 bit block-size; 12 < 80 - 16 > 80. |
PGP, 8-bit rounds algorithm. Block cipher. Symmetric.
-Tiny Encryption Algorithm (TEA) - -128-bit key size with a 64-bit block size.
64 rounds. | Feistel algorithm. Block cipher. Symmetric.
-SHARK - -A block cipher identified as one of the predecessors of Rijndael.
128-bit key size, 64-bit block size. Only 6 rounds. Block cipher. Symmetric.
-RC5 & RC6 - -Up to 2048 key size, can be either 32, 64, or 128-bit block
size. Rounds can be up to 255. Block cipher. Symmetric.
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