(19)

(11)

EP 1 831 802 A1

(12)

(43) Date of publication: 12.09.2007 Bulletin 2007/37 (21) Application number: 05821594.8 (22) Date of filing: 22.12.2005

(51) International Patent Classification (IPC):  G06F 17/30(2006.01) H04L 29/08(2006.01) (86) International application number: PCT/EP2005/057101 (87) International publication number: WO 2006/069967 (06.07.2006 Gazette 2006/27)

(84) Designated Contracting States: AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR (30) Priority: 29.12.2004 CN 200410102996 (71) Applicant: International Business Machines Corporation Armonk, New York 10504 (US)	(72) Inventors: ZHOU, Yu Chen, 11-1006, Bi Shui Yun Tian - Yi Yuan Beijing 100083 (CN) MA, Lin Beijing 100085 (CN) MA, Lei, Building No.9, 3-203, An Ning Zhang Xi Beijing 100085 (CN) (74) Representative: Williams, Julian David  IBM United Kingdom Limited Intellectual Property Law Hursley Park Winchester Hampshire SO21 2JN Winchester Hampshire SO21 2JN (GB)