7/29/2019 Network Security & Cryptography M.Tech (Day Time) SSP Mid 1 Examination

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JNTUH College of Engineering, kukatpally, Hyderabad

Department of Electronics and Communications Engineering

M.Tech (DT-SSP)-I Semester I Mid-term Examination

NETWORK SECURITY AND CRYPTOGRAPHYTime: 2 hours Max. Marks: 25

Answer any FIVE questions

All Questions carry equal marks

1) Explain the Affine Cipher Encryption and decryption, with keys (25, 25) for thefollowing plaintext: if you had the will, you will win. Yes you can.

2) Explain the NP-Hard problem advantage of visual cryptography. Explain the relationbetween visual cryptography and steganography, with at least four similarities and fourdifferences.

3) Explain, with an example, about the manipulators in cryptography. Write briefly aboutany five transposition ciphers of the following, for the plaintext: your self-confidence is

your god.

4) Discuss about the three attacks faster than the brute force attack for cracking the DESalgorithm.

5) Explain the Kerchoffs principle. Explain the theoretically ultimate secured cipheringalgorithm, and discuss about its practicality.

6) Discuss about the vigenere deciphering aspects, with the help of an example.7) Explain the shannons SP network concept of confusion and diffusion. Explain, with the

help of an example, the Fiestel Encipher and Deciphering for 16 rounds.

8) Explain the various security attacks and ways to thwart them. Discuss about the variouscryptanalysis attacks, with the help of an example.