Question: Suppose a message m is chosen randomly from the set of all five letter English words and is encrypted using an affine cipher mod 2

Suppose a message
m
is chosen randomly from the set of all five
letter English words and is encrypted using an affine cipher mod
26, where the key is chosen randomly from the 312 possible keys.
The ciphertext is
HHGZC
. Compute the conditional probability
Prob(m = HELLO c=HHGZC)
. Use the result of this
computation to determine whether of not affine ciphers have
perfect secrecy.

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