1.

What is the formula used for decoding the ciphered text using affine cipher(a,b are constants and x is the numerical equivalent of a letter to be encrypted)?

A. a<sup>-1</sup>(x-b)%26
B. (ax+b)%26
C. b<sup>-1</sup>(x-a)%26
D. b<sup>-1</sup>(x-a)
Answer» B. (ax+b)%26


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