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Ethereum Co-Founder Vitalik Buterin Says Cryptography’s Hardest Problem Is Still Unsolved

Key Takeaways Vitalik Buterin published a June 29, 2026, breakdown naming indistinguishability obfuscation cryptography’s hardest unsolved target. Current iO schemes are technically functional but carry runtimes that Buterin estimates exceed the universe’s age by many orders of magnitude. Buterin outlined 3 paths forward, including artificial intelligence (AI)-assisted optimization, that could eventually enable trustless voting and…

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