Question: If an encryption function ex is identical to the decryption function de for a given key, then the key k is said to be an

If an encryption function ex is identical to the decryption function de for a given key, then the key k is said to be an involutory key. There are exactly two involutory keys in the shift cipher. Find them.Hint: Find the keys by which you move forward or backward

(

in other words, you add or subtract mod

26),

you get the same result

. 0

and

130

and

11

and

251

and

130

and

25

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