Cryptography & Ciphers
LS47 Decryption
Decrypt LS47 hand-cipher text with its password and padding count. Uses the 49-character LS47 alphabet on a 7 x 7 grid.
This tool runs open-source code from CyberChef by GCHQ (Apache License 2.0). See open-source credits.
The password constructs a 7 × 7 grid. LS47 updates that grid as it processes the ciphertext.
The output contains plaintext after removal of the requested leading padding.
- Read an LS47 message from a CTF challenge or a hand-cipher hobby group.
Sources: LS47 author: cipher, alphabet, and password expansion
Decrypt a message with the supplied password
Input: (,t74ci78cp/8trx*yesu:alp1wqy
Settings: Password helloworld, Padding 0
Result: thequickbrownfoxjumped---test
The default Padding of 10 would remove thequickbr and return ownfoxjumped---test.
Check the alphabet, padding, and password
- Paste the ciphertext and enter the sender’s Password.
- Set Padding to the count used during encryption.
- Read any text after --- as the sender’s appended signature text.
- A wrong password can return unreadable text without an error.
- The appended signature is not cryptographic authentication.
- Use this hand cipher for compatible messages, not modern data protection.