February 2020
Beginner
621 pages
19h 34m
English
book
Introduction to Cryptography with Coding Theory, 3rd Edition
by Wade Trappe, Lawrence C. Washington
Content preview from Introduction to Cryptography with Coding Theory, 3rd Edition
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A.3 Examples for Chapter 2
Example 1
A shift cipher was used to obtain the ciphertext kddmu. Decrypt it by trying all possibilities.
In[1]:= allshifts[”kddkmu”]
kddkmuleelnvmffmownggnpxohhoqypiiprzqjjqsarkkrtbsllsuctmmtvdunnuwevoovxfwppwygxqqxzhyrryaizsszbjattackbuubdlcvvcemdwwdfnexxegofyyfhpgzzgiqhaahjribbiksjccjlt
As you can see, attack is the only word that occurs on this list, so that was the plaintext.
Example 2
Encrypt the plaintext message cleopatra using the affine function :
In[2]:=affinecrypt["cleopatra", 7, 8]
Out[2]=whkcjilxi
Example 3
The ciphertext mzdvezc was encrypted using the affine function . Decrypt it.
SOLUTION
First, solve for to obtain . We need ...
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