Post-quantum blockchains | Valeria Nikolaenko
Source: YouTube · a16z crypto · published Jun 2, 2023 · 52:25
Valeria's presentation explores the threat quantum computing poses to blockchain security and potential defenses 0:18. Quantum adversaries could break current digital signatures, forge validator signatures, and gain advantages in proof-of-work mining 2:47, potentially compromising blockchain security within 15 years based on current qubit growth rates 18:55.
Key Takeaways:
• Quantum computers could break all current digital signatures (ECDSA, RSA, etc.) used in blockchains, enabling theft and consensus attacks 2:47
• The number of qubits in quantum computers is doubling yearly, potentially reaching cryptographically dangerous levels within 15 years 18:55
• Post-quantum signature schemes (like Dilithium, Falcon, and SPHINCS+) are being standardized but have much larger key sizes 23:30
• Blockchain developers should implement hash-based key derivation and periodic quantum-safe validator signatures to protect against future attacks 26:20
The quantum threat to blockchains is serious but manageable with proactive implementation of quantum-resistant cryptographic techniques and gradual transition strategies 34:10.
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First 800 characters of the transcript
[Music] thank you very much for the introduction uh yeah my name is Valeria you can call me Lara that's less formal I prefer that um if you're cool with that so today we're going to discuss post Quantum blockchains Quantum Computing this is an exciting topic I know it was prompted by your questions so you get the message here the more technical questions you ask the more technical talks you're gonna get probably so but feel free to jump in with questions if you have any I'd be happy to answer them as we go I think this audience has no other audience would probably appreciate this topic because it's very futuristic we are look we'll be looking far ahead into the future and how the world of computing is gonna probably be changing uh governed by new laws of physics so it's kind of exciting bu…