Method and system for updating preshared key

A pre-shared key and update method technology, which is applied in the field of pre-shared key generation in wireless local area networks, can solve the problems of frequent pre-shared keys, dynamic updates, increased equipment costs, and difficulty in ensuring security. The effect of increasing randomness and dynamic range and ensuring security

Inactive Publication Date: 2009-09-02
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0015] 1. Since the AP usually does not have input/output devices such as keyboards and screens, it is usually necessary to update the pre-shared key in the AP on the PC (personal computer) connected to the AP, which is difficult to guarantee security and complicated to operate;
[0016] 2. It is impossible to realize the frequent and dynamic update of the pre-shared key
[0034] Although the Diffie-Hellman key exchange algorithm cannot prove its se

Method used

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  • Method and system for updating preshared key
  • Method and system for updating preshared key
  • Method and system for updating preshared key

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Embodiment Construction

[0057] The core idea of ​​the present invention is to use the basic principle of the Diffie-Hellman key exchange algorithm (hereinafter referred to as DH exchange) to update the pre-shared key, and update the prime number parameter P when using DH exchange each time, so that when using a smaller Under the premise of the P value, a relatively safe DH exchange can be realized.

[0058] The present invention will be described in detail below with reference to the drawings and embodiments.

[0059] figure 2 It is a flow chart of the update method of the pre-shared key in the embodiment of the present invention; in this embodiment, it is assumed that the pre-shared key to be updated is PSK0, and the shared key can be the key manually entered by the user, or it can be the key updated last time key; the communication nodes are STA (for example, mobile terminal) and AP respectively. Such as figure 2 As shown, the method includes the following steps:

[0060] 201: The STA sends a...

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Abstract

The invention relates to a method and a system for updating a preshared key. The method comprises the following steps: both communication sides take prime numbers which correspond to a preshared key to be updated as prime number parameters P for Diffie-Hellman Key exchange algorithm; both communication sides use prime number parameters P, positive integers g which are less than the prime number parameters P and random numbers sx and sy generated by respective communication side for calculating PX and PY, wherein PX= g<sx>(mod P) and PY = g<sy>(mod P); and both communication sides exchange the PX and the PY and take (PY)<sx>(mod P)= (PX)<sy>(mod P) as a new preshared key.

Description

technical field [0001] The present invention relates to a wireless local area network (Wireless Local Area Networks, WLAN for short), in particular to a method for generating a pre-shared key in a wireless local area network. Background technique [0002] As a typical implementation form of broadband wireless IP (Internet Protocol, Internet Protocol) network, wireless local area network refers to a computer local area network using wireless transmission media. It can communicate in areas where wiring is difficult, and is an important supplement to traditional wired local area networks. . Wireless local area network technology is the product of the combination of computer network technology and wireless communication technology. It has the advantages of supporting mobile computing, flexible and fast architecture, low maintenance costs and good scalability. It provides means for the mobility and personalization of communication. . [0003] With the gradual deepening of globa...

Claims

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Application Information

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IPC IPC(8): H04W12/04H04W12/06H04W28/18H04W84/12H04W12/0431H04W12/069
Inventor 刘建
Owner ZTE CORP
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