Hash-Based Signatures
Hash-based signatures are a type of digital signature scheme that relies on the security of hash functions rather than number-theoretic problems. Because they do not depend on the difficulty of factoring or discrete logs, they are inherently resistant to quantum attacks.
They have been studied for decades and are considered very secure, although they can have larger signature sizes than current elliptic curve methods. In the context of blockchain, they provide a reliable way to sign transactions in a post-quantum world.
As we move toward more secure infrastructure, these signatures are likely to become more common in high-security applications. They represent a proven, conservative approach to cryptographic security that prioritizes robustness over extreme efficiency.
They are a vital tool in the toolkit of quantum-safe design.