Quantum-secured blockchain
arXiv:1705.09258 · doi:10.1088/2058-9565/aabc6b
Abstract
Blockchain is a distributed database which is cryptographically protected against malicious modifications. While promising for a wide range of applications, current blockchain platforms rely on digital signatures, which are vulnerable to attacks by means of quantum computers. The same, albeit to a lesser extent, applies to cryptographic hash functions that are used in preparing new blocks, so parties with access to quantum computation would have unfair advantage in procuring mining rewards. Here we propose a possible solution to the quantum era blockchain challenge and report an experimental realization of a quantum-safe blockchain platform that utilizes quantum key distribution across an urban fiber network for information-theoretically secure authentication. These results address important questions about realizability and scalability of quantum-safe blockchains for commercial and governmental applications.
7 pages, 2 figures; published version
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- Optimizing the deployment of quantum key distribution switch-based networks
- Deploying hybrid quantum-secured infrastructure for applications: When quantum and post-quantum can work together
- Practical quantum multiparty signatures using quantum-key-distribution networks
- Quantum Advantage and Y2K Bug: Comparison
- Orchestrating Product Provenance Story: When IOTA ECOSYSTEM Meets The Electronics Supply Chain Space
- Modelling Attacks in Blockchain Systems using Petri Nets
- Modified Six State Cryptographic Protocol with Entangled Ancilla States
- Information-theoretically secure quantum timestamping with one-time universal hashing
- Scalable and Highly Fault-Tolerant Circular Quantum Byzantine Agreement