Patent ID: 9088890
Filing Date: 2015-07-21
Classification: G06F,H04L,H04W

Abstract:
1. A method for encrypting short data at a terminal in a wireless communication system, the method comprising: generating a short data burst in idle mode; generating a Traffic Encryption Key (TEK) based on a Cipher-based Message Authentication Code (CMAC)-TEK prekey derived from an Authorization Key (AK); constructing, by the terminal, a nonce based on a Packet Number (PN) which is the same value as an uplink CMAC PN (CMAC-PN_U) to be sent with a Ranging Request (RNG-REQ) message; encrypting the short data burst based on the TEK and the nonce; generating a Medium Access Control (MAC) Protocol Data Unit (PDU) that includes a MAC header, the encrypted short data burst, and a CMAC digest; and transmitting the MAC PDU to a base station (BS).