System for controlling access to a function, using a plurality of dynamic encryption variables
US5802176A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 22, 1996 |
| Grant date | Sep 1, 1998 |
| Priority date | — |
| Expiry date | Mar 22, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/3234
- WIPO fieldIT methods for management
- WIPO sectorElectrical engineering
Abstract
The system includes a first card-like unit adapted to communicate with a second unit giving only conditionally access to a function. Both units are capable of running software for generating a password by means of encryption of a plurality of dynamic variables produced separately but in concert (so as to have a predetermined relationship, such as identity, with one another) in the units. The encryption is carried out in each unit by a public algorithm using a dynamically varying encryption key. Each time an access request is issued by a card user, the key is modified as a function of the number of access requests previously formulated by the card user. Access to the function is granted when the passwords generated in the units have a predetermined relationship (such as identity) with each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.