Technique for compressing digital certificates for use in smart cards
US6564319B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 29, 1997 |
| Grant date | May 13, 2003 |
| Priority date | — |
| Expiry date | Apr 24, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M7/30
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A technique for compressing certificate information for use in portable credit instruments having limited storage capacity. An end user certificate typically actually comprises a chain of certificates, as SET transactions require not only the end user certificate and its parent certificates. Each certificate in the certificate chain is compared to a template for that certificate, and the differences are stored. Redundant differences within each certificate are deleted, as are differences which may be derived from differences stored for other certificates in the certificate chain. The remaining stored differences are then recorded on an end user credit instrument, such as a smart card. Preferably, the certificate chain is then recreated for verification purposes before the card is issued. PER encoding may also be employed to further compress the certificate information to be recorded on the credit instrument.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.