Method and apparatus for security protection of an original user identity in an initial signaling message

摘要

A wireless transmit/receive unit (WTRU) includes a control plane (C-plane) packet data convergence protocol (C-PDCP) layer which performs ciphering of a signalling message. The C-PDCP layer is activated upon power up of the WTRU and initial security parameters are located to the C-PDCP layer. An initial connection signalling message and a user identity are ciphering using the initial security parameters even before the WTRU is authenticated. The initial security parameters including a ciphering key (CK) may be generated from system information broadcast from the network. The CK may be a public key for asymmetric encryption, and may be selected from a public key set broadcast by or derived from the network system information. An index of the selected public key may be separated from a public key set broadcast by or derived from the network system information. An index of the selected public key may be separately encoded. Alternatively, the index may be communicated by using a Diffie-Hellman key exchange method. 4I=5 s qj- W- 0n m ra co r :se Cm Le LU LL cC o 080 CJJ 2e0 uJ~tu U-0I C o o *o LL r I a C, 53c 0 cC5