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Vitalik's Diamond iO Moves Program Obfuscation From "Impossible" to Theoretically Feasible

2026-07-29 01:16:15

According to Vitalik Buterin's technical article published July 29, Diamond iO program obfuscation advances from "theoretically impossible" to "feasible in theory." The new protocol modifies the BGG+14 attribute encryption scheme by nesting fully homomorphic encryption (FHE) within attribute-based encryption (ABE), drastically reducing runtime compared to conservative approaches. However, Vitalik noted Diamond iO relies on new cryptographic assumptions—all-product LWE and evasive LWE—whose security requires further verification, with efficiency bottlenecks stemming from hash computation depth and subexponential security parameter requirements.

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