Key Points
- Ethereum is prepared to counter a potential quantum computing attack, says co-founder Vitalik Buterin.
- The countermeasures would involve a hard fork and the introduction of new transaction types.
Ethereum co-founder, Vitalik Buterin, has expressed confidence in the platform's readiness to tackle a potential quantum computing threat.
Buterin, in a recent post on Ethereum Research, speculated on the consequences if a "quantum emergency" were to occur immediately.
Ethereum's Quantum Readiness
Buterin suggested that if quantum computers became available and malicious entities gained access to them, Ethereum is already equipped to implement a recovery fork to handle such a scenario.
This would involve a hard fork of the blockchain and users would need to install new wallet software. However, Buterin reassured that few users would lose their funds.
The hard fork process would require rolling back the Ethereum network to the point where large-scale theft was detected and disabling all conventional transactions from that point on.
Preventing Quantum Exploits
Buterin further explained that Ethereum developers would introduce a new transaction type, part of the RIP-7560, to enable transactions from smart contract wallets.
In a post-quantum world, a transaction from an Ethereum wallet would reveal the user's private key along with the public key. The new transaction type, which is central to the quantum-resistant EIP, would use Winternitz signatures and STARKs to ensure that existing wallets are switched to new validation code.
This validation code uses ERC-4337 account abstraction, the fundamental technology of smart contract wallets, to prevent private keys from being displayed while signing transactions in the future. This would make these accounts immune to a quantum attack.
Buterin also noted that users who have never approved a transaction from an Ethereum wallet are already safe from any potential quantum-related exploit, as only the wallet address has ever been made public.
He further stated that the infrastructure needed to implement such a hard fork could, in principle, be initiated immediately.
The prospect of quantum computing has long been a concern for the crypto industry, as a computer capable of breaking blockchain encryption could lead to large-scale theft of user funds. However, most computer scientists and developers agree that quantum computing is still some way off, with estimates suggesting it won't be sufficiently developed until 2029 at the earliest.
