About LS47 Encryption Tool
This is a slight improvement of the ElsieFour cipher as described by Alan Kaminsky. We use 7x7 characters instead of original (barely fitting) 6x6, to be able to encrypt some structured information. We also describe a simple key-expansion algorithm, because remembering passwords is popular. Similar security considerations as with ElsieFour hold. The LS47 alphabet consists of following characters: _abcdefghijklmnopqrstuvwxyz.0123456789,-+*/:?!'() A LS47 key is a permutation of the alphabet that is then represented in a 7x7 grid used for the encryption or decryption.
Input: text. Output: text.
Format reference: LS47 Encrypt background and specification
Example
Use “Try example” to load this public sample and its settings, then run it.
Settings used in this example
| Parameter | Example value | Input and choices |
|---|---|---|
| Password | "helloworld" | Text |
| Padding | 0 | Number |
| Signature | "test" | Text |
Sample keys and passwords are public. Never use them to protect real data.
Input
thequickbrownfoxjumped
Result
(,t74ci78cp/8trx*yesu:alp1wqy
Parameters
| Parameter | Default value | Input and choices |
|---|---|---|
| Password | "" | Text |
| Padding | 10 | Number |
| Signature | "" | Text |
Before interpreting the result
Use the exact key encoding, mode, padding and IV expected by the source system. Historical ciphers are useful for learning and analysis. Encoding alone provides no confidentiality.
How to use this page
- Paste your input or open a local file.
- Adjust tool options if needed, then choose Run tool.
- Copy the result or download the original output bytes.
Inputs and results are not added to the public catalogue or saved in the URL. Processing happens in your browser; HTTP Request and DNS over HTTPS send the requests you explicitly run. Files up to 128 MiB can be opened; decompression and image tools may have smaller processing limits. Large results have a shortened preview. Text and HTML downloads use UTF-8; binary downloads preserve output bytes. Pasted text follows browser newline handling; open a file when exact input bytes matter.