Portable secure semiconductor memory device
US5237609A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 26, 1990 |
| Grant date | Aug 17, 1993 |
| Priority date | — |
| Expiry date | Mar 26, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06Q20/357
- WIPO fieldIT methods for management
- WIPO sectorElectrical engineering
Abstract
A portable semiconductor memory device for interfacing with and exchanging information with an external terminal, said portable device having a security function for controlling access to a main memory. The main memory is adapted to exchange data with the external terminal by means of an interface bus which includes data lines, address lines and control lines. Access controls means in the portable unit is utilized to control access to the main memory. The unit also has a security memory comprising two sections. One section stores enciphered data which is read out to the external terminal, deciphered and returned to the unit as the first element used in a comparison. The second section of the security memory stores internal identification information. The two elements of identification information are provided to a comparator means which enables access to the main memory via the interface bus after a match is detected.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.