Hi Mohanapriya
From my understanding, you want to modify the output mappings of an “S-box” in a cipher.
Yes, you can change the outputs of an “S-box”, but doing so will alter its cryptographic properties and potentially its effectiveness. An “S-box” is a fundamental component in block ciphers, and its design is critical for ensuring security properties.
Considerations When Modifying an S-box:
- Avalanche Effect: A small change in the input should result in a significant change in the output. Ensure that the new mapping maintains this property.
- Non-linearity: The “S-box” should be highly non-linear to resist linear attacks. Verify that the new mappings do not introduce linear patterns.
- Bijectiveness: If the “S-box” is used in a context where it needs to be bijective, ensure that each input maps to a unique output and vice-versa.
- Cryptographic Strength: Changing the mappings might weaken the cipher unless carefully analyzed. Use cryptanalysis techniques to evaluate the strength of the new “S-box”.
Hope this helps!
