Obfuscation (Part II): Diamond IO
Summary
Vitalik Buterin analyzes Obfuscation (Part II): Diamond iO, describing a new approach that blends ABE and FHE to achieve program obfuscation with reduced runtime compared to traditional iO. The post details how Diamond iO encodes inputs, uses trapdoors and specific encodings to enable decryption only for the correct circuit, and discusses the security assumptions (evasive LWE and all-product LWE) and efficiency bottlenecks. It also contrasts the theoretical feasibility with practical challenges and outlines potential optimization paths.