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Method and device for protecting signalling in NAS (non-access stratum) layer

A signaling and terminal equipment technology, applied in the protection field of NAS layer signaling, can solve problems such as security reduction, and achieve the effects of improving security, increasing diversity, and meeting flexibility requirements

Active Publication Date: 2012-01-04
DATANG MOBILE COMM EQUIP CO LTD
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Problems solved by technology

[0040] Embodiments of the present invention provide a method and device for protecting NAS layer signaling, which solves the problem of reduced security caused by only using a 128-bit algorithm when protecting NAS signaling based on the AES algorithm in the prior art

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  • Method and device for protecting signalling in NAS (non-access stratum) layer

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Embodiment Construction

[0065] As mentioned in the background, once the NAS layer security procedure is established between the MME and the UE, all NAS signaling interactions will be protected by security context. In such a protection process, integrity protection and encryption are required, and the algorithms used mainly include SNOW 3G and AES.

[0066] Currently, within LTE, the AES algorithm used in signaling interaction at the NAS layer only uses an algorithm with a key length of 128 bits, referred to as AES-128. But in practical applications, for the AES algorithm, there are at least algorithms with key lengths of 192 and 256 bits (AES-192, AES-256). However, the existing AES algorithm with a fixed key length (128 bits) cannot meet the operator’s demand for variable key length, and cannot flexibly use AES-192 and AES-256 to encrypt and protect the integrity of NAS layer signaling .

[0067] Furthermore, in some special fields, there are more stringent requirements for communication security,...

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Abstract

The embodiment of the invention discloses a method and a device for protecting signaling in an NAS (non-access stratum) layer. Through applying the technical scheme provided by the embodiment of the invention, an AES (advanced encryption standard) algorithm composed of an EIA (EPS integrity algorithm) with 128 bit or other bits and an EEA (EPS encryption algorithm) with 128 bit or other bits can be used for protecting the signaling in the NAS layer, thus the protection of the signalling in the NAS layer is not restricted by the 128-bit-secret-key-length set in the prior art that the AES algorithm is used for encrypting the signalling in the NAS layer, and the secret key length in the AES algorithm can be flexibly selected according to the actual requirements. By using more varied algorithms and algorithm combination to protect the signalling in the NAS layer, the flexibility requirements in the actual application scenes can be satisfied, the diversity of protection strategies on the signalling in the NAS layer can be increased, and the security can be improved in the process of protecting the signalling in the NAS layer.

Description

technical field [0001] The invention relates to the field of communication technology, in particular to a method and equipment for protecting NAS layer signaling. Background technique [0002] NAS (Non Access Stratum, non-access stratum) layer between LTE (Long Term Evolution, long-term evolution), MME (Mobility Management Entity, mobility management entity) and UE (User Equipment, user equipment, that is, terminal equipment) In the signaling connection, there is a NAS security mechanism. Once the security procedures are established, all NAS layer signaling must be secured, including encryption and integrity protection. When the UE attaches to the network, user authentication and authentication are required, that is, EPS (Evolved Packet System, Evolved Packet System) AKA (Authentication and Key Agreement, authentication) is performed between UE, MME, and HSS (Home Subscriber Server, Home Subscriber Server). Right and key negotiation) process, in which the HSS sends the EPS...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L9/06
Inventor 吴鹏程习建德崔丽娜
Owner DATANG MOBILE COMM EQUIP CO LTD
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