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 signaling message. The C-PDCP is activated upon power up the WTRU and initial security parameters are loaded to layer. An connection message user identity ciphered using even before authenticated. including key (CK) may be generated from system information broadcast network. CK public for asymmetric encryption, selected set by or derived network information. index separately encoded. Alternatively, communicated Diffie-Hellman exchange method.