公开(公告)号：JP2003186395A

公开(公告)日：2003-07-04

申请号：JP2002313581

申请日：2002-10-29

Applicant: LUCENT TECHNOLOGIES INC

Inventor： ETZEL MARK H ,  FRANK ROBERT JOHN ,  HEER DANIEL NELSON ,  MCNELIS ROBERT J ,  MIZIKOVSKY SEMYON B ,  RANCE ROBERT JOHN ,  SHIPP R DALE

IPC: G09C1/00 ,  H04K1/06 ,  H04L9/06 ,  H04L29/06 ,  H04W12/00 ,  H04W12/02 ,  H04Q7/38

Abstract: PROBLEM TO BE SOLVED: To provide a method and apparatus for an emphasized CMEA (cellular message encryption algorithm) or an ECMEA process. SOLUTION: A forward ECMEA process decrypts text encrypted by an inverse ECMEA process, and the inverse ECMEA process decrypts the text encrypted by the forward ECMEA process. The forward ECMEA process utilizes a first transformation, iteration of the CMEA, and a second transformation. The inverse ECMEA process utilizes a first inverse transformation, the iteration of the CMEA process, and a second inverse transformation. The transformation and the inverse transformation, and the iteration of the CMEA process improve the security, utilizing a secret offset. The transformation and the iteration, of the CMEA process also utilize an emphasized TBOX function using an involuntary lookup table. COPYRIGHT: (C)2003,JPO