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(a) Briefly describe what is meant by the word cryptography. (b) Briefly describe the Vigenere cipher, including a...

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Advance Math

(a) Briefly describe what is meant by the wordcryptography.

(b) Briefly describe the Vigenere cipher,including a discussion of the encryption and decryptionprocesses.

(c) Describe what is meant by a ‘FeistelCipher’.

(d) DES includes S-boxes as part of itsencryption and decryption steps. Each of eight S-boxes is a fixed 4× 16 array, whose entries come from the integers 0, 1, . . . , 15.Describe in detail how DES transforms a 48-bit string into a 32-bitstring using the S-boxes.

(e) Without giving details of the algorithm,briefly discuss some of the shortcomings of DES.

THIS QUESTIONS FOR CRYPTOGRAPHY

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