Introduction to Cryptography - C839 blocks and key size Cipher I
Twofish CORRECT ANSWERS: 128 bits and key sizes of 128, 192, or 256 bits. It is a Feistel cipher. IDEA CORRECT ANSWERS: Operates on 64 bit blocks and has a 128 bit key. Consists of 8 identical transformations each round and an output transformation. CAST-128 CORRECT ANSWERS: Operates on 64 bit blocks and has a key size of 40-128 bits. Typically used in GPG and PGP. Encryption is either 12 or 16 rounds. CAST-256 CORRECT ANSWERS: Operates on 128 bit blocks and has a key size of 128, 160, 192, 224 or 256 bits. Encryption has 48 rounds. Skipjack CORRECT ANSWERS: Uses an 80 bit key to encrypt/decrypt 64 bit data blocks. It is an unbalanced Feistel network with 32 rounds. MD4 CORRECT ANSWERS: 128 bit output size, 512 bit block size, 32 bit word size, 3 rounds. Considered very insecure. MD5 CORRECT ANSWERS: 128 bit output size, 512 bit block size, 32 bit word size, 64 rounds. Infamously compromised by Flame malware in 2012. SHA-1 CORRECT ANSWERS: 160 bit output size, 512 bit block size, 40 bit word size, 80 rounds. SHA-224/SHA-256 CORRECT ANSWERS: 512 bit block size, 56 bit word size, 64 rounds. SHA-384, SHA-512, SHA-512/224, SHA-512/256 CORRECT ANSWERS: bit output size, 1024 bit block size, 64 bit word size, 80 rounds. SHA-3 CORRECT ANSWERS: Secure Hashing Algorithm. Designed by NSA. 224/256/384/512 bit output size, up to 1600 bit block size, 64 bit word size, 24 rounds. TIGER CORRECT ANSWERS: 192/160/128 bit output size, 512 bit block size, 53 bit word size, 24 rounds. RIPEMD CORRECT ANSWERS: 128 bit output size, 512 bit block size, 32 bit word size, 48 rounds. In 2004, a collision was discovered. RIPEMD-128/256 CORRECT ANSWERS: 128/256 bit output size, 512 bit block size, 32 bit word size, 64 rounds. RIPEMD-160 CORRECT ANSWERS: 160 bit output size, 512 bit block size, 32 bit word size, 80 rounds. RIPEMD-320 CORRECT ANSWERS: 320 bit output size, 512 bit b
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Western Governers University
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WGU C839
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introduction to cryptography c839 blocks and key size cipher i
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