Discrete Mathematics and Its Applications, Seventh Edition

Published by McGraw-Hill Education
ISBN 10: 0073383090
ISBN 13: 978-0-07338-309-5

Chapter 4 - Section 4.6 - Cryptography - Supplementary Exercises - Page 307: 5

Answer

a) $SURRENDER NOW$ b) $BE MY FRIEND$ c) $TIME FOR FUN$

Work Step by Step

(a) Given CEBBOMWB XYG let A=o, B=l, C-=2, D=3, E=4, F=5, G-=6, H=7, 1=8, J=g, K=IO, 1—11, M-=12, N=13, 0=14, P-=15, Q-=16, R=17, S=18, T-=lg, U=20, V-=21, W=22, X-=23, Y=24, Z=25 2411142313 141 23246 let us apply the decryption = (p — 10) mod 26: 182017174 133417 13 1422 let A=o, B=l, C-=2, D=3, E=4, F=5, G-=6, H=7, 1=8, J=g, K=IO, 1—11, M-=12, N=13, 0=14, P-=15, Q-=16, R=17, S=18, T-=lg, U=20, V-=21, W=22, X-=23, Y=24, Z=25 b)let A=o, B=l, C-=2, D=3, E=4, F=5, G-=6, H=7, 1=8, J=g, K=IO, 1—11, M-=12, N=13, 0=14, P-=15, Q-=16, R=17, S=18, T-=lg, U=20, V-=21, W=22, X-=23, Y=24, Z=25 1114 228 151 1814 2313 let us apply the decryption = (p — 10) mod 26: 14 1224 51784133 let A=o, B=l, C-=2, D=3, E=4, F=5, G-=6, H=7, 1=8, J=g, K=IO, 1—11, M-=12, N=13, 0=14, P-=15, Q-=16, R=17, S=18, T-=lg, U=20, V-=21, W=22, X-=23, Y=24, Z=25 BE MY FRIEND (c) Given DSWO PYB PEX let A=o, B=l, C-=2, D=3, E=4, F=5, G-=6, H=7, 1=8, J=g, K=IO, 1—11, M-=12, N=13, 0=14, P-=15, Q-=16, R=17, S=18, T-=lg, U=20, V-=21, W=22, X-=23, Y=24, Z=25 3182214 15241 15423 let us apply the decryption = (p — 10) mod 26: 198124 51417 520 13 let A=o, B=l, C-=2, D=3, E=4, F=5, G-=6, H=7, 1=8, J=g, K=IO, 1—11, M-=12, N=13, 0=14, P-=15, Q-=16, R=17, S=18, T-=lg, U=20, V-=21, W=22, X-=23, Y=24, Z=25 TIME FOR FUN
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.