Title:
【発明の名称】クロック同期化を有する機能へのアクセスを制御するシステム
Document Type and Number:
Japanese Patent JP2000508098
Kind Code:
A
Abstract:
A system including a first unit (2) consisting of a card capable of interacting with a second unit (3) that enables access to a function (1) only under certain conditions. Both units are designed to run software for generating passwords by encrypting a plurality of dynamic variables such as a time-dependent variable and/or a variable dependent on the number of authentication requests received. Encryption is performed using a dynamic encryption key. To synchronise the values of the variables simultaneously but separately generated in the two units, only a few lowest-weight digits of each variable are transferred from the first unit (2) to the second unit (3) by adding them to the transferred password. The synchronisation data is combined with corresponding variables in the second unit in order to calculate a value therein that normally leads to a match between the passwords calculated in the respective units. The match may then enable access to the function.
Inventors:
Audevale Eve
Application Number:
JP53407697A
Publication Date:
June 27, 2000
Filing Date:
March 21, 1997
Export Citation:
Assignee:
Active curl
International Classes:
G06F21/35; G07C9/00; G07F7/10; G06F21/31; H04L9/32; (IPC1-7): G06F15/00; G07F7/10; H04L9/32
Attorney, Agent or Firm:
Asakura Shozo