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

(a) Briefly describe what is meant by the word cryptography.

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

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

(d) DES includes S-boxes as part of its encryption 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-bit string 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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Expert Solution

Colby Messinger answered 1 year ago

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