Engineering B.E. (Computer Engineering) Sem 6 Cryptography and System Security May 2019 Question Paper - Mumbai University | munotes
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Semester-end · Cryptography and System Security
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Questions asked in this paper
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Q2 Solve any THREE from Question No. 2 to 6 marks
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Q1 a) Enlist security goals. Discuss their significance. 5 marks
- b) Compare AES and DES. Which one is bit oriented? Which one is byte oriented?
- c) What is authentication header(AH)? How does it protect against replay 5
- d) List various Software Vulnerabilities. How vulnerabilities are exploited to launch an attack 5
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Q2 a) Encrypt the plaintext message “SECURITY” using affine cipher with the key pair (3, 7). Decrypt to get back original plaintext 10 marks
- b) Explain different types of Denial of Service attacks. 10
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Q3 a) Users A and B use the Diffie-Hellman key exchange technique with a common prime 71 and primitive root 7. Show that 7 is primitive root of 71. If has private key x=5, what is A’s Public Key Ri? If user B has private key y=12, what is B’s public key R2? What is the shared secret key? 10 marks
- b) What are traditional ciphers? Discuss any one substitution and transposition cipher with example. List their merits and demerits 10
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Q4 a) Alice chooses public key as (7, 33) and B chooses public key as (13, 221). Calculate their private keys. A wishes to send message m=5 to B. Show the message signing and verification using RSA digital signature 10 marks
- b) Discuss in detail block cipher modes of operation. 10
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Q5 a) What is the need of SSL? Explain all phases of SSL Handshake protocol in 10 marks
- b) What are the requirements of the cryptographic hash functions? Compare MD5 and SHA Hash functions. State real world applications of hash functions 10
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Q6 Write short notes on any FOUR: 20 marks
- b. Buffer Overflow
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