(19)

(11)

EP 2 586 154 A1

(12)

(43) Date of publication: 01.05.2013 Bulletin 2013/18 (21) Application number: 11739121.9 (22) Date of filing: 17.06.2011

(51) International Patent Classification (IPC):  H04L 9/30(2006.01) H04L 9/32(2006.01) (86) International application number: PCT/GB2011/000915 (87) International publication number: WO 2011/161400 (29.12.2011 Gazette 2011/52)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 22.06.2010 GB 201010502 (71) Applicant: Thales Holdings UK Plc Addlestone, Surrey KT15 2NX (GB)	(72) Inventors: HAO, Feng Cambridge, Cambs CB1 2JD (GB) KREEGER, Matthew Nicolas Cambridge, Cambs CB1 2JD (GB) (74) Representative: Round, Edward Mark  Marks & Clerk LLP 90 Long Acre London WC2E 9RA London WC2E 9RA (GB)