MID_NS_VI - Birla Institute of Technology Science Pilani...

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Birla Institute of Technology & Science, Pilani Distance Learning Programmes Division First Semester 2007-2008 Mid-Semester Test (EC-1 Regular) Course No. : SS ZG513 Course Title : NETWORK SECURITY Nature of Exam : Closed Book Weightage : 40% Duration : 2 Hours Date of Exam : 04/08/2007 (FN) Note: 1. Please follow all the Instructions to Candidates given on the cover page of the answer book. 2. All parts of a question should be answered consecutively. Each answer should start from a fresh page. 3. Mobile phones and computers of any kind should not be brought inside the examination hall. 4. Use of any unfair means will result in severe disciplinary action. Q.1 (a). Suppose that a message has been encrypted using Data Encryption Standard in ciphertext block chaining mode. Assume that only one bit of ciphertext in block C i is accidentally changed from a 0 to a 1 during transmission. Find out how much plaintext will be garbled as a result. [6] Q.1 (b). Perform the following arithmetic in Galois field (2
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MID_NS_VI - Birla Institute of Technology Science Pilani...

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