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What Is the Decryption Function for an Aﬃne Cipher If $f ( x ) = ( 3 x + 7 ) \bmod 26 ?$

Question 147

Question 147

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What is the decryption function for an aﬃne cipher if the encryption function is $f ( x ) = ( 3 x + 7 ) \bmod 26 ?$

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