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Method for protecting access security of IP multimedia subsystem based on TLS

A technology for multimedia subsystems and security protection, applied in transmission systems, digital transmission systems, secure communication devices, etc., can solve the problems that user terminals do not support the use of certificates, cannot authenticate UE identities, etc., and overcome the problem of weak two-way authentication. simple effect

Active Publication Date: 2005-11-16
ZTE CORP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0020] Although the above TLS-based IMS access security scheme enables protected IMS signaling to penetrate NAT, it still has many problems
A more serious security problem is the one-way authentication problem during the establishment of a TLS session, because the TLS protocol supports the use of certificates for identity authentication by both communication parties, while 3GPP only supports the use of certificates on the network side, and does not support the use of certificates on the user terminal. Therefore, during the TLS session negotiation process between the UE and the P-CSCF, only the UE is allowed to authenticate the P-CSCF, and the P-CSCF cannot authenticate the identity of the UE, so the attacker can pretend to be a user to access the IMS, and act as a middleman for legitimate users. attack

Method used

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  • Method for protecting access security of IP multimedia subsystem based on TLS
  • Method for protecting access security of IP multimedia subsystem based on TLS

Examples

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Embodiment Construction

[0036] This embodiment takes figure 2 As an example, the method for protecting IMS access security by using the TLS / IMS AKA protocol in the present invention is described. In this embodiment, both the UE and the P-CSCF support the TLS / IMS AKA security mechanism. The cipher suites supported by the UE include TLS_RSA_WITH_IDEA_CBC_SHA, TLS_RSA_WITH_3DES_EDE_CBC_SHA, and TLS_RSA_WITH_DES_CBC_SHA. The cipher suites supported by the P-CSCF are TLS_RSA_WITH_3DES_EDE_CBC_SHA and TLS_RSA_ITH. The priority of the UE, the UE's IMS access process flow is as follows:

[0037] 1. The UE establishes a TCP connection with the P-CSCF.

[0038] 2. The UE sends an initial registration message (Register) SM1 to the P-CSCF, which includes the user's IMPI and IMPU, and the message also includes a list of cipher suites supported by the UE {TLS_RSA_WITH_IDEA_CBC_SHA, TLS_RSA_WITH_3DES_EDE_CBC_SHA, TLS_RSA_WITH_DES_CBC_SHA}. After receiving the registration message sent by the UE, the P-CSCF choos...

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Abstract

In registration process through UE, using IMS AKA protocol to negotiate with P -CSCF, the method discloses uses TLS connect session in TCP connection. Then, the TLS connect session guarantees transmission security of IMS signaling between UE and P -CSCF. Features are: simple implementing procedure, being able to protect access safety of IMS. Comparing with prior art, the invention overcomes issue of weak bi-directional authentication so that attacker is not able to implement intermediator attack.

Description

technical field [0001] The present invention relates to the security field of the communication system, in particular, the present invention relates to the protection method of IMS (IP Multimedia Subsystem) access security. Background technique [0002] IMS is a subsystem supporting IP multimedia services proposed by 3GPP2 in Release 5. It consists of all core network functional entities that can provide multimedia services, including a set of functional entities related to signaling and bearer. These functional entities involve CSCF (Call State Control Function), MGCF (Media Gateway Control Function), MRF (Media Resource Function), and HSS (Home Subscriber Server), etc. IMS is based on the SIP (Session Initiation Protocol) system. SIP is a text-based signaling protocol that works in the client / server mode. IMS uses the SIP call control mechanism to create, manage and terminate various types of multimedia services. In addition to SIP as the core, IMS has wide adaptability t...

Claims

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Application Information

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IPC IPC(8): H04L9/00
Inventor 田峰李睿
Owner ZTE CORP
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