If an encryption function er is identical to the decryption function dg, then the key K is said to be an involutory key. (a) Let K = (a, b) be a key in an affine cipher over Z/nZ. Show that K is an involutory key if and only if a-' = a (mod n) and b(a+1) = 0 (mod n).

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If an encryption function er is identical to the decryption function
dg, then the key K is said to be an involutory key.
(a) Let K = (a, b) be a key in an affine cipher over Z/nZ. Show that K is an
involutory key if and only if a- = a (mod n) and b(a+1) = 0 (mod n).
Transcribed Image Text:If an encryption function er is identical to the decryption function dg, then the key K is said to be an involutory key. (a) Let K = (a, b) be a key in an affine cipher over Z/nZ. Show that K is an involutory key if and only if a- = a (mod n) and b(a+1) = 0 (mod n).
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