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Calculate the Key Space for all the systems given below and explain if it is possible to use brute force technique to decrypt the cipher

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Calculate the Key Space for all the systems given below and explain if it is possible to use brute force technique to decrypt the cipher text without knowing the Key. a) A Feistel Structure based Cipher in which the plain text block is 32 bits and the Key size 128 bits. b) A Simple Substitution Cipher in which we use only 10 Characters. c) An affine Cipher with 32 characters

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