A kind of imsi privacy protection method and device based on physical layer key

Abstract

The invention discloses an IMSI privacy protection method and device based on a physical layer key. The random access process in a mobile communication system is used as an improvement object, and the physical layer key generation process is integrated in it to complete the two functions of the mobile terminal and the base station. Generate a paired physical layer key at the end, and use the physical layer key to realize the protection of IMSI private information. The physical layer key generated based on the channel characteristics of the present invention is only related to the wireless channel itself, and has nothing to do with the specific content of the signal transmitted on the channel. Since the channel characteristics are independent in space, the attacker cannot obtain the legal channel characteristics, and there is no cracking physical key. The possibility of layer keys solves the problem of secure transmission of IMSI private information at the signal level. The physical layer key generation process adopted by the present invention is interspersed in the random access process, only need to add key generation related software modules on the mobile terminal and the base station, without modifying the signaling process stipulated in the 3GPP standard protocol, which is different from the existing Compatible with mobile communication systems.

Description

technical field [0001] The invention belongs to the technical field of security protection of mobile communication systems, and in particular relates to an IMSI privacy protection method and device based on a physical layer key. Background technique [0002] As an epoch-making technology, mobile communication technology has changed people's way of life. With the continuous evolution of mobile communication systems and the continuous expansion of application fields, the services that mobile communication can provide are also continuously diversified. What comes is the requirements for its performance in various aspects, including bandwidth, delay, reliability, security and so on. [0003] In a mobile communication system, a series of behaviors of a mobile user (UE in the figure) accessing a core network for the first time are collectively referred to as an initial registration process. During the initial registration process, the basic signaling interaction process after the...

AI Technical Summary

Problems solved by technology

However, the principle of this scheme is based on the public key cryptography system, which has high computational complexity, and the overhead and delay brought to the system are also very large. Be applicable

And because the existing 4G mobile communication system does not have a public key infrastructure (PKI), the solution cannot be compatible with 4G and its previous mobile communication systems

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