WebSub: Cryptography (18CS744) Prepared By : Sagarika Behera 1.a) Explain the symmetric cipher model with a neat diagram. Ans: A symmetric encryption scheme has five … Weba) The so called S-box (Substitution box) is widely used cryptographic primitive in symmetric-key cryptosystems. In AES (Advanced Encryption Standard) the 16 S-boxes in each round are identical. All these S-boxes implement the inverse function in the Galois Field GF(28), which can also be seen as a mapping, S: f0;1g8!f0;1g8;so that x2GF(28) 7!
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