# UPTU MCA Question Paper 2012 Cryptography & Networks Security 4th Sem

UPTU MCA 4th Semester Paper 2012 Cryptography & Networks Security Gautam Buddh Technical University Exam 2012 4thYear Cryptography & Networks Security Test Question Paper Free Download Gautam Buddh Technical University Cryptography & Networks Security Question Papers 2012 UPTU MCA 4th Semester Question Paper 2012 for all students Previous Year old Past Papers of UPTU MCA 4th Semester Paper 2012 Cryptography & Networks Security Gautam Buddh Technical University Exam MCA 4th Semester Sample Model Question Papers Free Download PDF

**Cryptography & Networks Security**

1. Attempt any four out of the following

(a) What is denial of service attack’?

(b) What is Trojan Horse? What is the principle behind it?

(c) What is repudiation? How can it be prevented in real life?

(d) Let C be a block cipher of block size

(i) How many different block values are possible?

(ii) How many different permutations of blocks are possible?

(iii) If C is not an arbitrary permutation, but has key length k, how many trials will be required to break c through exhaustive key search.

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UPTU MCA Question Paper 2012 Cryptography & Networks Security 4th Sem