METHOD FOR GENERATING KEY OF ASYNCHRONOUS MOBILE COMMUNICATION SYSTEM

摘要

PURPOSE: A method for generating a key of an asynchronous mobile communication system is provided to generate the key by using parameters and typeid of the 3GPP(3rd Generation Partnership Project) standard in a process for performing an authentication and key agreement mechanism. CONSTITUTION: A Rand as random number data of 128bits is stored in byte units(100). The first byte, Rand(0) is added to Typeid. The Rand is divided into an upper R1(120) of 64bits and a lower R2(130) of 64bits. T1 of 64bits is obtained by using the R2(130) and an XOR operation value for the R1(120) and a user secret key of 128bits(140) as input values. O1 of 64bits is obtained by using an input sentence as an XOR operation value for the T1 of 64bits and the R1(120) and a key value as the R2(130) and the user secret key of 128bits(150). R1'(160) and R2'(170) are generated from the upper R1(120) of 64bits and the lower R2(130) of 64bits. T2 of 64bits is obtained by using the R2'(170) and an XOR operation value for the R1'(160) and the user secret key of 128bits as input values(180). O2 of 64bits is obtained by using an input sentence as an XOR operation value for the T2 of 64bits and the R1'(160) and a key value as the R2'(170) and the user secret key of 128bits(190). A final output, O is obtained by using the O1 and the O2.