Linora Cipher
Linora Cipher
The Linora Cipher is a symmetric neighbor-chain encryption algorithm developed by the cryptographic enthusiast modify[1] in 2025. It transforms alphabetic characters through modular arithmetic and chaining of differences between neighboring characters, resulting in ciphertext where each character depends on both the input and the immediately preceding character.
Overview
The Linora Cipher operates on lowercase alphabetic characters, mapping each letter to an integer value (a = 0 to z = 25). It uses a repeating numerical key and processes plaintext characters by computing modular differences relative to their neighbors. This chaining creates a dependency between consecutive characters, increasing diffusion and complicating frequency analysis.
Algorithm
Encryption
- Convert each character of the plaintext to its corresponding integer value.
- For the first character:
- Add the first key element to it modulo 26.
- For each subsequent character:
- Compute the difference between the current plaintext character and the previous plaintext character modulo 26.
- Multiply this difference by the corresponding key element (cycled through the key).
- Take the result modulo 26 to obtain the ciphertext character.
Decryption
- For the first character:
- Subtract the first key element from the ciphertext character modulo 26.
- For each subsequent character:
- Multiply the ciphertext character by the modular inverse of the corresponding key element modulo 26.
- Add this result to the previous plaintext character modulo 26 to recover the current plaintext character.
Example
Given a plaintext such as "hello" and a key such as [3, 5, 7], each character is encrypted by the above process. The chaining ensures that a change in any plaintext character affects all subsequent ciphertext characters.
Security Considerations
The Linora Cipher introduces a chaining mechanism similar to cipher block chaining (CBC) modes in block ciphers but operates at the character level. While the chaining improves resistance against simple frequency analysis, the cipher is not considered secure for high-stakes cryptographic applications without additional measures. It is primarily intended for educational, experimental, or lightweight obfuscation use cases.
Authorship and License
The Linora Cipher was created by modify in 2025. The author retains copyright but permits usage and adaptation with appropriate attribution.
See also
External links
- Linora Cipher repository – Reference implementation and documentation (if available).
This article "Linora Cipher" is from Wikipedia. The list of its authors can be seen in its historical and/or the page Edithistory:Linora Cipher. Articles copied from Draft Namespace on Wikipedia could be seen on the Draft Namespace of Wikipedia and not main one.
- ↑ The creator of the Linora Cipher
