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DavidGilbert
Posts: 40
Posted 00:44 Dec 03, 2011 |

1b is incomplete, I believe the final answer should be, 181 

2.3 is completely wrong:

 

Suppose Bob sends plaintext P=63, how does he encrypt and what’s the ciphertext C? After Alice receives C, how does she decrypts it to get the plaintext P? 

Calculating C:  the wrong values were used here, answer should be 149

Calculating P: was cut n pasted from 2.2, and is incorrect.  Should be 63

 

hpguo
Posts: 139
Posted 14:43 Dec 03, 2011 |

The solutions are corrected! Thanks for pointing it out!