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ECES Cryptography Algorithms keys/block size questions with correct answers
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DES - correct answer Symmetric Block Key size: 56 Block size: 64 Feistel Cipher w/ 16 rounds, 48 bit key for each round. Use of 8 S-boxes 3DES (Triple DES) - correct answer Symmetric Block Key size: 56 Block size: 64 Performs DES function 3 times w/ 3 different keys. DESx - correct answer Variation of DES that employs key whitening. XOR a 64 bit key with the text before the round function, after or both. Advanced Encryption Standard (AES) - correct answer Symmetric Block Key size: 128, 192, or 256 Block size: 128 Designated FIPS 197 Substitution-permutation matrix Blowfish - correct answer Symmetric Block Key size: variable from 32 to 448 Block size: 64 16 round Feistel Cipher
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