公开(公告)号：GB2454871A

公开(公告)日：2009-05-27

申请号：GB0722497

申请日：2007-11-16

Applicant: MOTOROLA INC

Inventor： KAEHLER MORTEN ,  CHATER-LEA DAVID JOHN ,  PEDERSEN KRISTIAN GRONKJAER ,  KRUEGEL CHRIS ARTHUR

IPC: H04W12/00 ,  H04L12/22 ,  H04W12/06 ,  H04W12/08 ,  H04W12/10 ,  H04W12/12

Abstract: A communication system (100) including a group management processor (144) operable to divide an enlarged group of user terminals formed by patching of smaller groups into sub-sets of user terminals including: (1) an encrypted sub-set of terminals (103,113, 123) which are operable to undertake only encrypted communications; and (2) a selectable-clear sub-set of terminals (105, 115, 125) which includes: (i) selectable terminals that are able to undertake clear communications and, when selected, encrypted communications; and (ii) clear terminals that are operable to undertake only clear communications; and a translator (143) operable to translate a communication sent in a first encrypted form from a user terminal (103) of one of the sub-sets into the second encrypted form suitable for decryption by user terminals (105, 115) of the other sub-set.