Blockchain-based password authentication key exchange and authentication method resistant to quantum attacks

By using a single-round PAKE protocol based on a lattice-based smooth projection hash function with trapdoors, the problems of quantum attack resistance and low authentication efficiency in blockchain are solved, achieving high security and efficient key exchange, and adapting to complex Internet environments.

CN120956407BActive Publication Date: 2026-05-26GUIZHOU UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
GUIZHOU UNIV
Filing Date
2025-10-11
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing password authentication key exchange protocols are weak against quantum attacks in blockchain scenarios, have low authentication efficiency, are prone to privacy data leakage, and are difficult to adapt to the complex Internet operating environment.

Method used

Design a single-round PAKE protocol based on a lattice with a trapdoor smooth projection hash function. By introducing a trapdoor mechanism and Verhp and Thash algorithms, a quantum-resistant password authentication key exchange method is constructed. By combining linear operations on the lattice and noise vectors to generate common parameters, communication and computation efficiency are optimized.

Benefits of technology

It achieves highly secure and efficient key exchange in a quantum-resistant environment, significantly reducing communication rounds and computational overhead, and improving the security and authentication efficiency of key exchange between blockchain nodes.

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Abstract

This invention discloses a quantum-attack-resistant blockchain-based password authentication key exchange and authentication method. The method involves inputting preset parameters, a trapdoor, a matrix, a noise vector, a password, and a public key into a computer system; executing a parameter generation algorithm to generate public parameters; executing a hash key generation algorithm to generate a hash key and a projected hash key generation algorithm to generate a projected hash key; generating a tag based on the identifiers of both communicating parties and the projected hash key, encrypting it to obtain ciphertext, and transmitting and receiving the projected hash key and ciphertext from the communicating party; verifying the validity of the communicating party's projected hash key, and generating a session key based on relevant parameters; and finally, the computer system processor executes a computer program and outputs the session key. This invention integrates a lattice-based smooth projected hash function with a trapdoor and a blockchain structure, possessing quantum attack resistance, general composable security characteristics, requiring only one round of communication, and is suitable for large-scale blockchain node scenarios.
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