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(a) Describe DES encryption with a block diagram and brief steps.

(b) How does triple DES improve security. What is the effective key length of triple DES? How can 3DES be compatible with DES?

(c) Describe a one way hash function and give an example. Give essential properties of the hash functions.

(d) Define message authentication. Explain MAC.

(e) Give three known attacks on AES encryption.

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  • Reference No.:- M9585410

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