Wireless self-organizing network cryptographic key updating and repealing method

Abstract

The invention relates to updating and repealing methods for a wireless self-organized network key. During the network operation stage, a device can apply for key updating to a plurality of servers of the network without the support of a credible authentication center. The successful responses which are equal or more than the number of thresholds are obtained so as to carry out key updating successfully and to realize automatic repealing of the key. A public key with an elliptical curve combination is combined with a threshold password so as to improve the efficiencies of key management and network device authentication; the support of the credible authentication center is needed only at the initialization stage of the key when the method is used. During the network operation stage, the device can automatically carry out key updating without the credible authentication center, thus reducing the calculation and communications volume between the device authentication and the key negotiation process.

Description

technical field [0001] The invention belongs to the field of network security, relates to a key management method, in particular to a distributed network key initialization, update and revocation method. Background technique [0002] Wireless ad hoc network is a wireless network with no center, self-organization, multi-hop routing, dynamic topology and resource constraints. Before wireless ad hoc network is widely used, security issues are the key issues that need to be solved. Its characteristics of no center and self-organization make its security problem more difficult to solve than traditional wireless networks. Device key management is the foundation of identity authentication and the foundation of network security. [0003] Elliptic curve composite public key is a key management method. Let the elliptic curve equation on the prime number field F(p) be formula (1). [0004] E:y 2 =(x 3 +ax+b)modp (1) [0005] The set of all solutions of equation (1) on the field F...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that it needs to distribute passwords in a physical way; there is no mechanism to provide keys to devices that join later, and it cannot revoke the keys of members who leave early; it cannot provide individual authentication; and it requires devices to have considerable computing power. Capability, because each round of key negotiation includes multiple modular exponentiation operations, so it is not suitable for wireless ad hoc network environments

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