Wired microcircuit card and a method for transactions between a corresponding wired microcircuit card and a terminal
US5128997A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 17, 1990 |
| Grant date | Jul 7, 1992 |
| Priority date | — |
| Expiry date | Jul 17, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07F7/0866
- WIPO fieldIT methods for management
- WIPO sectorElectrical engineering
Abstract
The invention concerns a microcircuit card of the kind comprising: PA1 a communication interface; PA1 an internal memoryp PA1 a wired processor unit allowing this internal memory to be addressed from the outside. According to the main characteristic of the invention, provision is made for a secret internal memory zone not addressable from the outside, and the processor unit comprises a wired circuit capable of using the contents of the secret memory for establishing a first serial cryptographic function of two operands and means reacting to the interrogation of predetermined addresses of the internal memory, accompanied by a keyword by applying this keyword and the output of the internal memory as operands of the wired circuit, whilst the output of the wired circuit is applied to the interface.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.