Year of fee payment : 4. A system for generating a blockchain comprises first circuitry for receiving a first group of data. Blockchain processing circuitry generates a blockchain for a plurality of groups of data. The blockchain processing circuitry generates the blockchain by generating a first nonce for a first block of the blockchain. The blockchain processing circuitry performs a first hash using the first group of data and the first nonce as an input to a hash function to generate a first digital signature for the first block as an output.
The hash function uses encryption based on quantum key distribution using N-state qudits where N is greater than 2. The block chain processing circuitry receives a second group of data and generates a second nonce for a second block of the blockchain.
A second hash is performed using the second group of data, the second nonce and the first digital signature to generate a second digital signature for the second block as an output. The hash function uses encryption based on the quantum key distribution using N-state qudits where N is greater than 2.
Patent Application No. The present invention relates to blockchains, and more particularly, to a quantum resistant blockchain using quantum key distribution. Quantum computers process information according to the laws of quantum mechanics. This means an increase in computational processing for specific problems i. Blockchain offers an open, public, distributed ledger that has many applications, including digital currencies. The security of this ledger depends on the difficulty of solving certain cryptographic problems which are threatened by the potential of quantum computation.
Specifically, hashes as used in signing the blocks of the ledger can be compromised. The principal threat is Grover's algorithm, which can dramatically speed up function inversion. This allows the generation of a modified pre-image from a given hash a hash collision allowing a signed data block to be modified. This destroys authenticity of the ledger entries undermining the entire blockchain. The second threat is Shor's algorithm, which applies to any part of blockchain that relies on asymmetric key cryptography.
