Quantum Computing Threat Looms Large for Crypto, Experts Warn

A newly released report, commissioned by Coinbase, underscores the importance of proactive measures to address the looming threat of quantum computing to the cryptocurrency industry. The report, compiled by a panel of renowned cryptographers and academics, highlights that while today's blockchains are secure, the advent of a fault-tolerant quantum computer capable of breaking widely used encryption is becoming increasingly plausible. As a result, the industry must start preparing now to mitigate potential risks. The report notes that Google researchers have estimated that a sufficiently advanced quantum computer could potentially break Bitcoin's cryptography, prompting major crypto ecosystems to begin developing strategies to counter this threat. For instance, the Ethereum Foundation has proposed new digital signature types designed to be safe against quantum computers, while Solana and other platforms are exploring quantum-resistant wallet designs. Although current quantum machines are not yet powerful enough to crack the cryptography underpinning Bitcoin, Ethereum, and other networks, the report cautions against complacency, emphasizing that the timeline for the development of a large-scale, fault-tolerant quantum computer is uncertain but clearly on the horizon. The U.S. National Institute of Standards and Technology recommends migrating to quantum-resistant cryptography by 2035, a timeline that may prove optimistic. The report stresses that waiting for the threat to become urgent is not a viable strategy, as transitions across blockchains, wallets, and exchanges could take years to execute safely. Some assets may be more vulnerable than others, with Bitcoin wallets that have already revealed their public keys potentially being targeted. Fortunately, quantum-resistant cryptography already exists and is being standardized by NIST. However, the transition to post-quantum cryptography will not be straightforward, as post-quantum digital signatures can be significantly larger than current ones, potentially increasing blockchain data costs and reducing throughput. The report outlines multiple transition strategies, including hybrid systems that combine existing cryptography with post-quantum updates, and recommends flexible approaches that avoid sacrificing current security or performance while enabling rapid upgrades later. Ultimately, the report concludes that the time to begin preparing for the quantum computing threat is now.