Vitalik Buterin Identifies Indistinguishability Obfuscation as Cryptography's Hardest Unsolved Problem

According to his blog post published on June 29, 2026, Vitalik Buterin identified indistinguishability obfuscation (iO) as cryptography's most difficult unsolved challenge. Current iO schemes are technically functional but carry runtimes Buterin estimates exceed the universe's age by many orders of magnitude. Buterin outlined three potential paths forward, including AI-assisted optimization, that could eventually enable trustless voting systems and private smart contracts without requiring trusted intermediaries.
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