Question: Let Pi denote the Vigen re cipher where the message space consists of all 3 - character strings ( over the English alphabet )

Let \Pi denote the Vigenre cipher where the message space consists of all 3-character strings (over the
English alphabet), and the period t is fixed to 2(and so the key is a uniform string of length 2). Define
A as follows: A outputs m_(0)= "aaa" and m_(1)= "aab". When given a ciphertext c, it outputs 0 if the first
char acter of c is the same as the third character of c, and outputs 1 otherwise. Compute
Pr[PrivKK_(A,\Pi )^(eav)=1].
Let \ Pi denote the Vigen re cipher where the

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