Affine Cipher Tool

📥 Ciphertext Input

Paste ciphertext (A-Z/a-z only):

Ready to crack 312 keys

Skip (a): multiplier, must be coprime to 26
Shift (b): additive shift mod 26

🏆 BEST DECRYPTION

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📈 Frequency Match

🔑 Top 12 (skip, shift) Keys

Sorted by χ² score (lower=better)

Plaintext to encrypt:

Skip (a) - multiplier:

Shift (b) - additive:

Ready to encrypt

Formula: E(x) = (a × x + b) mod 26

🔐 Encrypted Output

No encryption yet

🔑 Current Key

Used for encryption above

a = -

Skip (multiplier)

b = -

Shift (additive)