(19)
(11) EP 1 352 309 A2

(12)

(88) Date of publication A3:
31.07.2003

(43) Date of publication:
15.10.2003 Bulletin 2003/42

(21) Application number: 01996000.4

(22) Date of filing: 28.11.2001
(51) International Patent Classification (IPC)7: G06F 1/00
(86) International application number:
PCT/US0144/825
(87) International publication number:
WO 0204/4874 (06.06.2002 Gazette 2002/23)
(84) Designated Contracting States:
AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR
Designated Extension States:
AL LT LV MK RO SI

(30) Priority: 29.11.2000 US 253864 P
24.11.2001 US 253864 P

(71) Applicants:
  • Schlumberger Systems SA
    92120 Montrouge (FR)

    FR 
  • Schlumberger Technologies Operating Ltd.
    BVI Road Town, Tortola (VG)

    AT BE CH DE DK ES FI GB GR IE IT LU MC NL PT SE TR CY 

(72) Inventors:
  • BRAGSTAD, Helge
    N-N-1353 Barums Verk (NO)
  • DOLPH, Edwin, J.
    Austin, TX 78750 (US)
  • MCLAUGHLIN, James, A.
    Austin, TX 78759 (US)
  • TALBOT, Marc
    Austin, TX 78729 (US)

(74) Representative: den Braber, Gerard Paul 
50, avenue Jean Jaurès,B.P. 620-12
92542 Montrouge Cedex
92542 Montrouge Cedex (FR)

   


(54) METHOD, APPARATUS AND COMPUTER PROGRAM PRODUCT FOR INTEROPERABLE CRYPTOGRAPHIC MATERIAL