Table 18 Comparison of Rule 90 with other cellular automata rules for cryptographic use.
CA Rule | Type | Cryptographic Properties | Output Pattern | Suitability for Cryptography |
|---|---|---|---|---|
Rule 90 | Linear | Fast, low-complexity, reversible | Predictable, symmetric | Weak if used alone; useful for lightweight key derivation |
Rule 30 | Nonlinear | High entropy, chaotic | Aperiodic, pseudo-random | Strong for key generation and stream cipher applications |
Rule 45 | Nonlinear | Moderate entropy, more chaotic than 90 | Asymmetric, partially unpredictable | Moderate; better than Rule 90 alone |
Rule 150 | Linear | Reversible, more complex than Rule 90 | Symmetric, less predictable | Weaker than Rule 30; better than Rule 90 |
Hybrid CA | Mixed Rules | High complexity, rule-switching enhances randomness | Fully dynamic, less predictable | Strong; suitable for secure encryption and key expansion |
