Anyone any good with codebreaking?....
Let plaintext be written in the alphabet a, b, . . . , y, z and let ciphertext be
written in the alphabet A, B, . . . , Y, Z. Both alphabets have N = 26 letters.
Consider the affine cipher on digraphs with encryption
E( ) = 9 + 43mod676:
Encipher the plaintext TRUTHS.
In this question I want to use standard numbering, so A=0, B=1..... Z=25