Since "katu128" appears to be a unique code name for a new feature, I have drafted a comprehensive Product Requirement Document (PRD) based on the naming convention (which sounds technical/algorithmic, possibly related to encryption, data routing, or a specific hardware specification).
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indicates a iterative design process—common in cryptography when initial versions are found to have subtle vulnerabilities or inefficiencies. The paper would analyze: Cryptanalysis: katu128
Conclusion