Question: If an encryption function ek is identical to the decryption function dk, then the key K is said to be an involutory key. Find all

If an encryption function ek is identical to the decryption function

If an encryption function ek is identical to the decryption function dk, then the key K is said to be an involutory key. Find all the involutory keys in the Shift Cipher over Z 26

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