Reliable document authentication system
US4853961A · kind A · utility
179Cited by
6References
17Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 18, 1987 |
| Grant date | Aug 1, 1989 |
| Priority date | — |
| Expiry date | Dec 18, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07B2017/00911
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A system for reliably authenticating a document includes a device having a decryption key therein that, upon application to information provided by a user, reveals not only a plain text message indicating the source of the authentication but, in addition, provides the decryption key for use with the information provided by the mailer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.