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why 16 rounds are used in single DES algorithm, and why we are using 3 keys in triple des. why not 2,4,5
16 rounds are used in DES as a tradeoff between performance and speed of the algorithm.
Triple DES uses 3 keys but a better version of triple des is to use only 2 keys and still achieve the desired level of encryption. If i remember correctly, use K1 for encrypting message M, then use K2 for decrypting, then again use K1 for ecnrypting, thus giving 3DES. for more info, read "Cryptography and Network Security" by William Stalllings.
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