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Point-to-point secret key negotiation method based on physical layer pilot frequency presetting

A key agreement, point-to-point technology, applied in the direction of electrical components, wireless communication, security devices, etc., can solve the problems of complex implementation, high cost, and reduce the length of the generated key, so as to achieve the difficulty of implementation, low cost, and anti-eavesdropping performance Good, the effect of improving the consistency rate

Active Publication Date: 2016-01-27
XI AN JIAOTONG UNIV
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Problems solved by technology

However, most of the key agreement schemes proposed by these researches, such as group shift quantization (GSQ), need to be completed at a high level, and the information exchanged through the public channel is more, the cost is high, the implementation is more complicated, and the physical layer transmission is not fully utilized. specialty
Very few negotiation schemes are similar to channel quantization with guard bands (CQG), although it can improve KAR, and the negotiation process is simple, just eliminate the channel characteristics at the quantization boundary, but this type of method will obviously reduce the length of the generated key

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  • Point-to-point secret key negotiation method based on physical layer pilot frequency presetting

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Embodiment Construction

[0027] The following uses an example in which the base station and the mobile station are respectively configured with single antennas to illustrate the specific implementation process of the method for generating a key by means of pilot frequency preconditioning. The following design is just to explain the idea and principle of the invention, but the scope of the invention is not limited to specific examples and conditions, such as the number of antennas, channel characteristics selected by quantization, the order in which base stations and mobile stations obtain keys, and the number of pilots. length, the length of the key to be generated, the selection of orthogonal sequences and scrambling codes, etc.

[0028] Consider the simplest point-to-point key negotiation model here: the base station and the mobile station need to complete key generation and negotiation by estimating and quantifying their respective channel characteristics; the base station adopts TDD duplex mode, an...

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Abstract

The invention discloses a point-to-point secret key negotiation method based on physical layer pilot frequency presetting. The method comprises the steps that a mobile station transmits a standard pilot frequency signal to a base station, and the base station estimates and quantizes the complex channel coefficient of an uplink via the standard pilot frequency signal so that the required base station side secret key is obtained; the base station calculates a pilot frequency presetting complex coefficient so that an equivalent complex channel coefficient obtained by multiplying of the pilot frequency presetting complex coefficient and the complex channel coefficient of the uplink is enabled to be at the central position of a complex channel coefficient quantitative judgment domain; and the base station transmits pilot frequency obtained by multiplying of the pilot frequency presetting complex coefficient and standard pilot frequency, and the mobile station estimates and quantizes the equivalent complex channel coefficient of a downlink via the standard pilot frequency signal so that the required mobile station side secret key is obtained. The whole process of secret key generation, negotiation and distribution is completed in one time according to physical layer pilot frequency presetting so that the method has advantages of high consistency rate of the generated secret keys, great intercepting resistance and low realization difficulty and cost.

Description

technical field [0001] The invention relates to the secure communication field of a wireless communication system, in particular to realizing key generation, negotiation and distribution of communication parties through physical layer pilot frequency preadjustment. Background technique [0002] With the rapid development of modern communication technology, wireless communication has gradually become the mainstream of people's daily and even military communication methods because of its convenience. Wireless communication uses antennas to use electromagnetic waves as carriers to meet people's communication requirements. However, due to the openness of wireless electromagnetic wave transmission, anyone can intercept communication information at a location where the space electromagnetic signal is strong enough. Therefore, compared with wired, the security of wireless is more difficult to guarantee, and how to ensure that legitimate users can reliably receive confidential infor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04W12/04H04W72/14H04W12/041H04W12/0431
CPCH04W12/04H04W72/23
Inventor 王文杰杨骞
Owner XI AN JIAOTONG UNIV
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