Quantum Computer Resistance
To assessment, there is a real threat of Quantum Computers, not only to the blockchains, but to every cryptographic standard we use in our everyday life like Banking, E-commerce, Password managers or TLS communication. There are particular cryptographic schemes that are being developed to resist the attacks of the Quantum computer, called lattice-based schemes and are currently under review with NIST.
To be sustainable in the long term, it is important for blockchains to establish an implementation roadmap for quantum-resistant solutions. Given the complexity of blockchains, early applications in quantum computing would more likely focus on cryptographic problems that are easier to solve.
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