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Katu 128 is a symmetric-key block cipher that operates on 128-bit blocks of data. It was designed to be a secure and efficient encryption algorithm for a wide range of applications, from secure data storage to secure communication protocols.

// Exactly 128 bytes of state
const state = new Float64Array(8); // 8 * 8 bytes = 64 bytes? Wait.
// No. Float64 is 8 bytes. 8 * 8 = 64. Too small. That's not the flex.

Force Protection: Provides a mobile shield for advancing ground troops or static high-value assets (airfields, command posts).
Anti-Access/Area Denial (A2/AD): When networked with long-range SAMs, the KATU128 fills gaps in coverage, making airspace penetration more difficult for adversary aircraft.
Resilience: Its mobility makes it a difficult target for anti-radiation missiles (ARMs), as its location can be changed rapidly after emission.

4. User Stories

As a Backend Engineer, I want to implement KATU128 so that I can secure real-time sensor data without overwhelming the microcontroller’s RAM.
As a Security Auditor, I want to validate the 128-bit signature chain so that I can certify the data has not been tampered with in transit.

What is Katu128?