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Which parameters and design choices determine the actual algorithm of a Feistel cipher?
Wiki User
∙ 12y ago
Block size: Larger block sizes mean greater security but reduced encryption/decryption speed. A block size of 64 bits is a reasonable tradeoff and has been nearly universal in block cipher design. However, the new AES uses a 128-bit block size.
Key size: Larger key size means greater security but may decrease encryption/decryption speed. Key sizes of 64 bits or less are now widely considered being inadequate and 128 bits has become a common size.
Number of rounds: The essence of the Feistel cipher is that a single round offers inadequate security but that multiple rounds offer increasing security. A typical size is 16 rounds.
Sub key generation algorithm: Greater complexity in this algorithm should lead to greater difficulty of cryptanalysis.
Round function: Again, greater complexity generally means greater resistance to cryptanalysis.
Wiki User
∙ 12y ago
Muhammad Attaullah
Block size: Larger block sizes mean greater security but reduced encryption/decryption speed. A block size of 64 bits is a reasonable tradeoff and has been nearly universal in block cipher design. However, the new AES uses a 128-bit block size.Key size: Larger key size means greater security but may decrease encryption/decryption speed. Key sizes of 64 bits or less are now widely considered being inadequate and 128 bits has become a common size.Number of rounds: The essence of the Feistel cipher is that a single round offers inadequate security but that multiple rounds offer increasing security. A typical size is 16 rounds.Sub key generation algorithm: Greater complexity in this algorithm should lead to greater difficulty of cryptanalysis.Round function: Again, greater complexity generally means greater resistance to cryptanalysis.
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What are onscreen lists of command choices?
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What is the difference between a fuzzy algorithm and a genetic algorithm?
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