Crypto companies are actively working to enhance the security of their wallets and custody solutions against potential threats from quantum computing. This initiative aims to ensure that user-facing infrastructure can adapt more quickly than the core protocols of blockchains like Bitcoin and Ethereum, which may take years to upgrade. There is a growing consensus among experts that the timeline for a significant quantum computing event—referred to as “Q-Day”—could arrive sooner than anticipated, possibly as early as 2030.
Silence Laboratories is among the firms leading the charge in integrating post-quantum security into crypto wallets. The company has recently introduced support for multi-party computation (MPC) signatures utilizing ML-DSA, a cryptographic algorithm recognized by the National Institute of Standards and Technology (NIST). CEO Jay Prakash noted that Silence Laboratories has spent months scrutinizing three recently approved algorithms: SPHINCS+, Falcon, and CRYSTALS-Dilithium, to determine their compatibility with distributed signing systems used by custodians and institutional wallets.
Prakash indicated that while these algorithms were promising, not all would necessarily meet the efficiency requirements for MPC. He emphasized the potential fragmentation that could arise, as different blockchain networks may adopt varying schemes with unique optimization criteria, signature sizes, or computational efficiencies.
The key to Silence Laboratories’ approach lies in generating shares across isolated nodes, facilitating joint signature production without ever reconstructing the original key. This method is crucial in defending against quantum threats, as experts believe that such computers could potentially breach existing cryptography in the near future. Prakash reported that institutions are recognizing the critical nature of distributed signing, sufficiently aware that keys should not be centralized.
MPC systems, which divide private keys across multiple devices, are becoming standard practices among custodians and institutional wallets. Silence Laboratories aims to integrate its solutions into these existing infrastructures seamlessly. After a straightforward code upgrade, institutions can benefit from a post-quantum MPC wallet without needing to alter their operational approach. Prakash assured that this change would be invisible to end users, meaning they would continue using their wallets, such as MetaMask, with a layer of post-quantum protection.
While Silence Laboratories exemplifies the direction in which some firms are heading, the crypto industry is divided on how to best tackle the quantum risk. Some developers focus on upgrading wallet-level security, while others argue that modifications at the protocol level are necessary to afford comprehensive protection for users.
Other companies are exploring alternative paradigms. For instance, the team behind a wallet from Postquant Labs is devising a system that incorporates quantum-resistant signatures on Bitcoin through an additional smart contract layer, thereby circumventing alterations to the base protocol. Similarly, StarkWare researcher Avihu Mordechai Levy has proposed a solution that substitutes Bitcoin’s elliptic-curve cryptography with hash-based signatures compliant with the existing network rules. While this approach is viewed as a “last-resort” strategy rather than a scalable fix, it poses its own set of challenges and potential costs.
Despite the absence of currently operational quantum computers capable of undermining existing encryption, rapid advancements in technology have ignited a sense of urgency among experts, prompting firms to pursue early-stage solutions. However, Prakash warns that without equivalent upgrades to blockchain protocols, wallet enhancements alone may not suffice in providing a robust defense against quantum risks.
