Decrypt each of the following cipher texts:i) Text: "CBBGYAEB

Question

Decrypt each of the following cipher texts:

i) Text: "CBBGYAEBBFZCFEPXYAEBB", encrypted with affine cipher with key (7,2).

ii) Text:"KSTYZKESLNZUV", encrypted with Vigenère cipher with key "RESULT"

05 Feb 2025

Answer :

Word Count : 480

i) Affine Cipher Decryption:

The affine cipher encryption formula is:
\[
E(x) = (ax + b) \mod m
\]
Where:
- \(a\) and \(b\) are the keys
- \(m\) is the size of the alphabet (for English, \(m = 26\))
- \(x\) is the index of the letter in the plaintext
- The decryption formula is:
\[
D(y) = a^{-1}(y - b) \mod m
\]
Where \(a^{-1}\) is ______ _________ _____ ______ _________ _________.
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