Method of generating a unique number for a smart card and its use for the cooperation of the card with a host system
US5068894A · kind A · utility
233Cited by
3References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 22, 1990 |
| Grant date | Nov 26, 1991 |
| Priority date | — |
| Expiry date | Aug 22, 2010 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L9/3271
- WIPO fieldIT methods for management
- WIPO sectorElectrical engineering
Abstract
A smart card (1) which includes a random access memory RAM (10) and a read-only memory PROM (7) incorporating a production key (PK), a distributor key (MK), a bearer code (CP) and a serial number (NS) generates a unique number (NU) which is stored in the memory RAM (10) in the card after execution of the following steps of a program which is specific of the card: PA1 a - modulo-2 addition and storage in the RAM (10) of the result: EQU PK.sym.MK=KMP, PA1 b - the encryption of a unique input message ME, generated by the card, by means of a reversible algorithm (ALG, ALB.sup.-1) using the key KMP: EQU NU=ALG.sub.KMP (ME).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.