Method and apparatus for storage of accounting information in a value dispensing system
US5749078A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 23, 1996 |
| Grant date | May 5, 1998 |
| Priority date | — |
| Expiry date | Aug 23, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07B2017/00741
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A value dispensing system comprising a portable data carrier and a terminal. The portable data carrier including a memory having stored therein accounting information indicative of an amount of value available for dispensing. The terminal including a memory and means for dispensing value and adapted to receive the portable data carrier and process a transaction which dispenses a given value in response to a digital token generated by the portable data carrier using a first cryptographic key. For the value dispensed, the postage evidencing system creates a transaction record having a secret portion which is indicative of the amount of value available for dispensing on the portable data carrier wherein the secret portion of the transaction record is encrypted using a second cryptographic key derived from the first cryptographic key, and the transaction record is stored in the terminal memory.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.