Cryptogram lock system with automatically variable true random code tonglingge
US6415386B1 · kind B1 · utility
10Cited by
4References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 2, 1999 |
| Grant date | Jul 2, 2002 |
| Priority date | — |
| Expiry date | Feb 2, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C2009/00793
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
This invention provides an autonomous random dynamic cryptogram lock system which comprises a lock body and a key body. There are non-volatile memories in both the lock body and key body respectively and each memory stores a set of cryptogram corresponding. When unlocking the microprocessor in the lock body checks the cryptograms. If matching, the lock is unlocked, otherwise it gives up alarm. After unlocking, the microprocessor renews a set of the corresponding real random cryptogram in both memories for unlocking next time. It accomplishes one cryptoguard function every time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.