Tezos has launched TzEL, a post-quantum privacy system on testnet, aimed at protecting blockchain transaction data from future decryption attacks. Co-founder Arthur Breitman criticized parts of the Bitcoin community for dismissing quantum computing risks as conspiracy theories, warning that complacency could leave networks vulnerable. The system addresses 'harvest now, decrypt later' attacks, where adversaries collect encrypted data now to decrypt later with quantum computers. TzEL uses quantum-resistant zk-STARK proofs, but these are larger than current proofs, posing scalability challenges. Tezos relies on its data availability layer to handle the increased load. Breitman emphasized urgency, noting that while practical quantum computers are not yet a threat, they could arrive as early as 2030 according to Project Eleven. He argued that developers have time to upgrade but not to quibble, and Tezos is already introducing post-quantum signatures.

Key facts

• Tezos launched TzEL post-quantum privacy system on testnet.
• Arthur Breitman criticized Bitcoin community for ignoring quantum risks.
• TzEL protects against 'harvest now, decrypt later' attacks.
• Quantum-resistant proofs are larger, requiring data availability layers.
• Q-Day could arrive as early as 2030, warns Project Eleven.
• Tezos is already introducing post-quantum signatures for accounts.

KeyAudit data perspective