🛡️ Lambda-Shield v2: The Collatz Stream Cipher

Lambda-Shield is a high-speed, lightweight stream cipher leveraging the deterministic chaos of the Collatz (3n+1) Trajectory.

🥊 The Competitor: ChaCha20

While ChaCha20 is the industry standard for software-defined encryption, it requires maintaining a 512-bit state (16 x 32-bit words) and performing multiple "Quarter Round" operations involving constant arrays.

Lambda-Shield v2 Advantages for IoT:

• Zero Constants: No "expand 32-byte k" strings or magic tables.
• Minimal State: Operates on a single u128 state.
• Energy Efficiency: Purely Arithmetic (Add, Shift, XOR, Multi). Perfect for saving Joules on button-cell powered sensors.

🛠️ v2 Specifications

• Keyspace: 128-bit (seed_hi + seed_lo).
• Mixing: 32 Collatz steps per byte + Murmur3-style output conditioning.
• Symmetry: XOR-based stream cipher (Encryption == Decryption).

🚀 Usage

cargo build --release
./target/release/lambda-shield --msg 12345 67890 "Your Secret Message"