Key exchange method, system and component based on third party

By distributing symmetric keys and random numbers between entities and trusted third parties, and using stream cipher algorithms and XOR operations to generate encrypted data, secure key exchange and strength management between entities are achieved, ensuring that third parties cannot obtain the shared keys.

CN122268570APending Publication Date: 2026-06-23QUANTUMCTEK CO LTD +1
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Patent Information

Application Number
CN202411899147.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-20
Publication Date
2026-06-23

AI Technical Summary

Technical Problem

In existing key exchange methods based on trusted third parties, the third party may obtain the shared keys between entities, leading to unintended leaks in certain application scenarios.

Method used

By distributing symmetric keys and random numbers between an entity and a trusted third party, encrypted data is generated using stream cipher algorithms and XOR operations. The trusted third party selects and exchanges encryption keys, and the entity ultimately decrypts the data to generate the final key, ensuring that the third party cannot obtain the shared key.

Benefits of technology

It enables the final key to be held only between entities, enhancing the system's control capabilities and key strength management, and meeting the security requirements of specific application scenarios.

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Abstract

The invention provides a key exchange method and system based on a third party, and a trusted third party and an entity thereof, and the trusted third party only participates in the identity authentication of the entity and assists the entities of both parties in key negotiation and other processes, and cannot obtain a shared key between the two entities. The problem that in an existing key exchange scheme based on a trusted third party, the trusted third party cannot be prevented from obtaining the exchange key is effectively solved, and it is guaranteed that only two entities participating in key exchange have the finally exchanged key. Besides, in the invention, the trusted third party can also provide a random number to participate in final key generation, so that the strength of the final key can be ensured, the requirement that the trusted third party needs to manage the strength of the exchange key in a specific application scene is met, and the management and control capability of the system is enhanced.
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