Affine Cipher Decoder & Encoder
intermediateE(x) = (ax + b) mod 26 — combines multiplication and addition
What is Affine Cipher?
The affine cipher is a cipher or encoding system used to transform messages. Each letter or character is transformed according to the cipher's specific algorithm.
How Affine Cipher Works
Enter your text in the tool above and click Encode or Decode to transform it. For ciphers that require a key, enter it in the key field.
Affine Cipher in Pop Culture
This cipher or encoding system has appeared in puzzles, games, escape rooms, and throughout cryptographic history.
How to Break Affine Cipher
The security of any classical cipher depends on its key length and the quality of the encryption method. Many classical ciphers can be broken using frequency analysis.
Frequently Asked Questions
How do I decode Affine Cipher?
Enter your ciphertext in the tool above, select "Affine Cipher" from the dropdown, choose Decode mode, enter the key, and click the button. Results appear instantly.
What is Affine Cipher used for?
Affine Cipher was used for secret communication. It offers better security than simple ciphers and was used for serious communication.
How secure is Affine Cipher?
Affine Cipher provides moderate security against casual attacks but is vulnerable to dedicated cryptanalysis. It's suitable for historical study but not modern security.