Title:
【発明の名称】単位カウンタの秘密保護付き管理方法と同方法を実行する秘密保護モジュール
Document Type and Number:
Japanese Patent JP2002508632
Kind Code:
A
Abstract:
The invention concerns a method for securely managing a units counter in an electrically programmable and erasable memory, whereby a number of units consumed by users is recorded by means of a counter, consisting in breaking down the units counter into at least two memory zones (A, B), one first zone (A) wherein a bit is stored per unit consumed and a second zone (B) wherein the value corresponding to the accumulation of bits consumed is stored, the second zone being only updated when the number of units consumed exceeds or reaches the number of non-stored bits in the first zone. The invention is applicable to security modules provided in telephone terminals.
Inventors:
Coho-Uries, Carroll-Audrey
Pouriac, Mireille
Banchelan, Xavier
Pouriac, Mireille
Banchelan, Xavier
Application Number:
JP2000538494A
Publication Date:
March 19, 2002
Filing Date:
February 10, 1999
Export Citation:
Assignee:
GEMPLUS
International Classes:
G07F7/10; G07F7/02; G07F7/08; H04M15/00; H04M17/00; H04M17/02; (IPC1-7): H04M17/02; G07F7/10; H04M15/00; H04M17/00
Attorney, Agent or Firm:
Keiichi Ota