Title:
AUTONOMOUS RANDOM DYNAMIC CRYPTOGRAM LOCK SYSTEM
Document Type and Number:
WIPO Patent Application WO/1997/004202
Kind Code:
A1
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 keybody 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.
Inventors:
SHI YI (CN)
TAN WEIZHI (CN)
TAN WEIZHI (CN)
Application Number:
PCT/CN1996/000051
Publication Date:
February 06, 1997
Filing Date:
July 10, 1996
Export Citation:
Assignee:
SHI YI (CN)
TAN WEIZHI (CN)
TAN WEIZHI (CN)
International Classes:
G07C9/00; (IPC1-7): E05B49/02; E05B49/00; E05B37/20
Domestic Patent References:
| WO1991018169A1 | 1991-11-28 | |||
| WO1986001360A1 | 1986-02-27 |
Foreign References:
| EP0077101A2 | 1983-04-20 | |||
| US4534194A | 1985-08-13 |
Other References:
See also references of EP 0957220A4
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