A hash chain is a sequence of cryptographic hash values, where each successive hash is computed from the previous one. Starting with an initial seed value, each new element in the chain is derived by applying a one-way hash function to the preceding element. This structure creates a verifiable and tamper-evident link between sequential data points. Hash chains are used in various cryptographic applications, including proof-of-work systems and time-stamping.
Context
Hash chains serve as foundational components in many blockchain architectures, particularly in establishing the chronological order and integrity of blocks. Discussions often relate to their role in securing data structures and their efficiency in specific cryptographic protocols. Future developments might involve optimizing hash chain constructions for quantum resistance or for use in more advanced zero-knowledge proof systems, enhancing their utility in novel applications.
Expander Signature decouples heavy key generation from verification, enabling resource-limited devices to achieve constant-size, efficient, and forward-secure authentication.
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