A simple linear cipher originally used on the Hebrew alphabet. Atbash is considered a special case of Affine Cipher, a monoalphabetic substitution cipher.
The ATBASH cipher is pretty simple, and all its does is reverse the letters in the alphabet: A becomes Z, B becomes Y, ..., Y becomes B, Z becomes A.
Here's the full table:
| A | B | C | D | E | F | G | H | I | J | K | L | M |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Z | Y | X | W | V | U | T | S | R | Q | P | O | N |
| N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| M | L | K | J | I | H | G | F | E | D | C | B | A |
Encoding the word crypto, we get:
C R Y P T O
X I B K G LWe can observe that applying the code twice to a message letter, will leave us with the original message. To decrypt, we just have to re-apply the code.
X I B K G L
C R Y P T O- Pretty simple and famous cipher.
- Frequency analysis can be used to crack the code, if the message is long enough.
| Language | Encrypt | Decrypt |
|---|---|---|
| C | ATBASHCipher.c | ATBASHCipher.c |
| C++ | main.cpp | main.cpp |
| Javascript | encrypt.js | decrypt.js |
| Python | encrypt.py | decrypt.py |
| Swift | lib.swift | lib.swift |
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