(a) Symmetric model (b) Cryptography (c) Cryptanalysis (d) Steganography
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1 Code No: RR Set No Write short notes on (a) Symmetric model (b) Cryptography (c) Cryptanalysis (d) Steganography 3. (a) Illustrate Diffie-hellman Key Exchange scheme for GF(P) [6M] (b) Consider a diffie-helman scheme with a common prime q=11 and a primitive rootα=2 i. If user A has public key Y A = 9, what is A s private key X A? ii. If user B has public key Y B = 3, what is the shared key K? [10M] 4. Given 2 as a primitive root of 29, construct a table of indices, and use it to solve the following congruences: (a) 17x 2 10 mod 29 (b) x 2 4x 16 0 mod 29 (c) x 7 17 mod 29 [5+5+6] 5. (a) what are digital signature standards? (b) Explain Digital signature algorithm. [8+8] 6. (a) What problem was Kerberos designed to address? (b) What are three threats associated with user authentication over a network or Internet? (c) List three approaches to secure user authentication over a network or Internet? 7. (a) What is replay attack? [4+4+8] (b) Why does ESP include a padding field? [6+10] 1 of 2
2 Code No: RR Set No. 1 2 of 2
3 Code No: RR Set No (a) What is Steganography? [6M] (b) Explain various modes of operations of block ciphers [10M] 3. (a) Explain the process encryption and decryption in Elliptic curve cryptography? (b) Explain the additive rules of Elliptic Curve Cryptography? 4. (a) Explain Chinese Remainder Theorem. (b) State and prove Euler s theorem? (c) Using Fermat s theorem, find 201 mod 11. [5M+5M+6M] 5. (a) What is a message authentication code? (b) What is difference between message authentication code and a one-way hash function? (c) In what ways can a hash value be secured so as to provide message authentication? 6. (a) What is R64 conversion? (b) Why is R64 conversion useful for an application? [5+5+6] (c) Why is the segmentation and reassembly function in PGP needed? [4+6+6] 7. Write a short note on (a) Electronic mail Services (b) Firewalls [8+8]
4 Code No: RR Set No (a) What are the various components of symmetric cipher model? Explain. (b) Write short notes on crypto analysis. 3. (a) What is a one-way function? (b) What is trap-door one-way function? (c) Describe in general terms an efficient procedure for picking a prime number? [5+5+6] 4. Given 2 as a primitive root of 29, construct a table of indices, and use it to solve the following congruences: (a) 17x 2 10 mod 29 (b) x 2 4x 16 0 mod 29 (c) x 7 17 mod 29 [5+5+6] 5. (a) What is the difference between weak and strong collision resistance? (b) What is the role of a compression function in a hash function? [6+10] 6. Explain X.509 Authentication services [16] 7. (a) List and briefly define the parameters that define an SSL session state? (b) List and briefly define the parameters that define an SSL session connection? [8+8]
5 Code No: RR Set No (a) What are differences between a block cipher and a stream cipher? (b) Explain various modes of operations of block ciphers. 3. (a) Consider the Elliptic curve E11 (1,6) that is, the curve is defined by y 2 = x 3 + x + 6 with a modulus of P=11.Determine all of the points in E11(1,6) (b) For E11(1,6), consider the point G=(2,7) Compute the multiples of G from 2G through 4G 4. (a) Explain in detail about Extended Euclid s Algorithm. (b) Using above algorithm find the multiplicative Inverse of 1234 mod [8+8] 5. (a) List requirements for a Hash Function. (b) What basic arithmetical and logical functions are used in SHA-1? [6+10] 6. (a) What is R64 conversion? (b) Why is R64 conversion useful for an application? (c) Why is the segmentation and reassembly function in PGP needed? [4+6+6] 7. Write note on Encapsulating security payload. [16] 8. Write notes on (a) Fire walls (b) Trojan Horse Defense [8+8]
Total No. of Questions : 09 ] [ Total No.of Pages : 02
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