Question
Plaintext is encrypted using the affine cipher $y=3 x+5 \bmod 26$; then the ciphertext in encrypted again using the affine cipher $y=15 x+4 \bmod 26$. Give a simple equivalent to the compound cipher.
Step 1
The first cipher is given by the equation \( y_1 = 3x + 5 \mod 26 \) and the second cipher is given by \( y_2 = 15x + 4 \mod 26 \). Show more…
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