Document authentication method
US4807287A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 6, 1987 |
| Grant date | Feb 21, 1989 |
| Priority date | — |
| Expiry date | Apr 6, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07D7/20
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A system for authenticating a document includes a uniqueness characteristic reader to generate a first identifier for the document. The identifier is then encrypted and optionally encoded to define an error correction code. The encrypted identifier and the optional error correction code are combined in accordance with a predefined format to define a code which is stored on the document itself (such as on a magnetic stripe). Authentication of the document is accomplished by reading the code on the item. The code is then processed to identify the location and quantity of any erroneous data. The identified location and quantity information for erroneous data, in conjunction with the optional error correction code, is then utilized to correct all errors in at least the encrypted identifier portion of the code read from the storage medium. The resultant encrypted identifier is therefore retrieved from the storage medium on the item without error. The retrieved encrypted identifier is then decrypted to retrieve the first identifier. A second item identifier is generated by reading the uniqueness characteristic from the document in the same manner that the first item identifier was genera…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.