Method and system for supporting security and information for proximity based service in mobile communication system environment

Abstract

A method for acquiring security related information for Proximity based security (Prose) search and prose communication by User Equipment (UE) in a mobile communication network is provided. A security communication method for UE for prose includes transmitting an attach request to an evolved Node B (eNB), receiving an attach response that includes security related information for the prose from the eNB, and performing device-to-device communication using the security related information.

1 . A security communication method for user equipment (UE) for proximity based services (prose), the security communication method comprising:
 transmitting, to a prose function, a first message including a public key of the UE and a prose function identification (ID);   receiving, from the prose function, a prose authentication token in response to the first message;   transmitting, to the prose function, a second message including a value determined based on the prose authentication token;   receiving, from the prose function, a third message including a prose group key (PGK), a PGK ID, and a prose public land mobile network (PLMN) list;   generating a prose traffic key (PTK) based on the PGK and a PTK ID;   deriving a prose encryption key (PEK) based on the PTK;   receiving, from the prose function, a public key of another UE communicating with the UE; and   performing a device-to-device (D2D) communication by encrypting data based on the PEK and using the public key of the other UE.