US 2014/0233737 A1 · Method and system for generating an identifier of a key

Abstract

A method for generating an identifier of a key includes that: when a user equipment (UE) transfers from an evolved UMTS terrestrial radio access network (EUTRAN) to a universal terrestrial radio access network (UTRAN) or a global system for mobile communications (GSM), or an enhanced data rate for GSM evolved radio access network (GERAN), an identifier of a system key after transfer is generated by mapping an identifier KSIASME for an access security management entity, and a mobile management entity generates an identifier of a ciphering key (CK) and an integrity key (IK) by mapping the KSIASME, and then sends the generated identifier to a serving GPRS support node (SGSN), when the UE transfers from the EUTRAN to the UTRAN, the SGSN stores the ciphering key, the integrity key and the identifier thereof, and when the UE transfers from the EUTRAN to the GERAN, the SGSN assigns the value of the identifier of the ciphering key and the integrity key to an identifier of a ciphering key of the GERAN.

Claims18

Dependent claims

A method for generating an identifier of a key, comprising:

when a User Equipment (UE) transfers from an Evolved UMTS Terrestrial Radio Access Network (EUTRAN) to a Global System for Mobile Communications (GSM) or to an enhanced data rate for GSM Evolution Radio Access Network (GERAN),
generating, by a Mobility Management Entity (MME), an identifier of a ciphering key and an integrity key by mapping a key set identifier for an access security management entity, and sending the ciphering key, the integrity key and the identifier thereof to a Serving GPRS Support Node (SGSN);
assigning, by the SGSN, a value of the identifier of the ciphering key and the integrity key to an identifier of a ciphering key of the GSM or GERAN, that is, a sequence number of the ciphering key;
and
generating, by the UE, an identifier of the ciphering key of the GSM or GERAN by mapping the key set identifier of the access security management entity.

2 more elements

A system for generating an identifier of a key, which is suitable for generating an identifier of a system key when a UE transfers from an EUTRAN to a GSM or GERAN, comprising:

a UE, a Mobility Management Entity (MME) and a Serving GPRS Support Node (SGSN), wherein,
the UE is configured to generate an identifier of a ciphering key of the GSM or GERAN by mapping a key set identifier for an access security management entity;
the MME is configured to generate an identifier of a ciphering key and an integrity key by mapping a key set identifier for the access security management entity, and to send the ciphering key, the integrity key and the identifier of the ciphering key and integrity key to the SGSN;
and
the SGSN is configured to receive the ciphering key, the integrity key and the identifier thereof which are sent by the MME, and to assign the value of the identifier of the ciphering key and the integrity key to the identifier of the ciphering key of the GSM or GERAN;
wherein, a mode of the generating by mapping comprises:
the MME is configured to assign the value of the identifier of the ciphering key and the integrity key to be a value of the key set identifier of the access security management entity, or to be a sum of the value of the key set identifier of the access security management entity and a constant which is appointed by the UE and a network side;
and
the UE is configured to assign the value of the identifier of the ciphering key of the GSM or GERAN to be the value of the key set identifier of the access security management entity, or to be a sum of the value of the key set identifier of the access security management entity and a constant which is appointed by the UE and the network side.

6 more elements

Dependencies are inferred from the claim text.

Method and system for generating an identifier of a key

Life of this patent

Method and system for generating an identifier of a key

Life of this patent

Abstract

Claims18