CSVTU Exam Paper BE VII Sem CRYPTOGRAPHY & SECURE COMMUNICATION, APR-MAY 2011

CSVTU QUESTION PAPER

B. E. VII Sem, ET & T, APR-MAY 2011

CRYPTOGRAPHY & SECURE COMMUNICATION

Note: Part(a)of each question is compulsory. Solve any two parts from rest.

Q.1 (a) What requirement must a public key cryptography system fulfill to be a secure algorithm. 2

(b) Differentiate between Fermat’s theorem and Euler’s theorem.  7

(c) Discuss RSA algorithm                        7

(d) Discuss Diffie Hellman’s key exchange algorithm.                    7

Q.2 (a) What do you mean by secure communication?            2

(b) Justify the use of hash function in cryptography & secure communication.  7

(c) Differentiate between a message authentication and one way hash function. 7

(d) Discuss about Brute force attack algorithm. 7

Q.3 (a) Compare MD5 and MD4.   2

(b) Discuss MD-5 message digest algorithm.                                   7

(c) Explain digital signature standard.                                             7

(d) Explain the fundamentals of encryption and decryption using secure hash function.                 7

Q.4 (a) What is firewall? State its importance.                      2

(b) How the threats are affecting to web security and traffic security?            7

(c) Draw the IP security architecture with its advantages & disadvantages.     7

(d) Discuss SSL architecture.                                                                      7

Q.5 (a) Differentiate between stegnography and cryptography.                      2

(b) Discuss in brief the different categories of steganography.                        7

(c) What is spread spectrum steganography?What is its significance .             7

(d) In case of stegnography,discuss the aspects of deterministic & in deterministic model of information theory.       7

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