M.Sc. (MATHEMATICS WITH APPLICATIONS IN COMPUTER SCIENCE) co (MACS) Term-End Examination CD
June, 2013 MMTE-006 (P) : CRYPTOGRAPHY Maximum Marks : 40
Time : 11/2 hours
Note :
There are two questions in this paper totalling 30 marks. Answer both of them. Remaining 10 marks are for the
viva-voce. 1.
The following text was encrypted using a shift cipher. UVTIP GKZEX JYZWK TZGYV IZJVR JPQQQ. Write a programme in C language that prints all possible shifts. Use your programme to decipher the above encrypted text and find the
15
encryption and decryption keys.
2, 14, 2 2.
(a) Find the inverse of
6, 9, 12 1,
E
GL3(83)
5
3, 2
using G.P.
MMTE-006 (P)
1
P.T.O.
(b) Write a programme in G.P. that decrypts 10 using Vigenire cipher. Decrypt the following text "(2DLIVI TPI WAOOECBOT UNUNCI PNF WVR THE CAXERBGAD" Using the key "MARKTWAIN".
(MACS) Term-End Examination CD June, 2013 MMTE-006 (P)
June, 2013. MMTE-006 (P) : CRYPTOGRAPHY. Time : 11/2 hours. Maximum Marks : 40. Note : There are two questions in this paper totalling 30 marks. Answer both of them. Remaining 10 marks are for the viva-voce. 1. The following text was encrypted using a shift 15 cipher. UVTIP GKZEX JYZWK TZGYV IZJVR. JPQQQ.
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