ME – 069

*ME069*

II Semester M.E. (CSE/IT/CN) Degree Examination, June/July 2015 (2K13 Scheme) CN 22 : NETWORK SECURITY Time : 3 Hours

Max. Marks : 100

Instruction : Answer any five complete questions. 1. a) Explain security services defined by X.800 that ensures adequate security of the systems or data transfer.

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b) List and briefly define categories of passive and active security attacks. Justify which attack is more damaging.

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2. a) Mention various Cipher block modes of operation. Explain with a block diagram any two methods.

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b) Explain the various transformations in each round of an Advanced Encryption Standard (AES) Algorithm with a neat diagram. 10 3. a) Using RSA algorithm with A = 1, B = 2 ... Encrypt and Decrypt the text ALGOL for given data p = 13, q = 31 and d = 7. b) What are stream Ciphers ? Explain RC4 Algorithm with a neat diagram. 4. a) What are digital signatures ? Explain its requirements and categories.

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b) Mention the various ways in which public key can be distributed. Explain public key certificate.

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c) Write a note on one way hash function.

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5. a) What are Kerberos ? Explain the overview of the Kerberos version 4 with Authentication Dialogue.

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b) What are the key features of X.509 certificate ? How are they issued and revoked by the certificate authority ?

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6. a) Discuss different counter measures to preventive DOS and Reactive DOS. 10 b) Explain Grid management and Trust management solutions.

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7. a) Mention the various routing attacks and its solutions. Discuss.

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b) List and discuss various Grid Authorization Systems. 8. a) Explain Wired Equivalent Privacy (WEP) decryption scripts. b) Explain the various IEEE 802.11 management frame types. –––––––––––––––

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