Key and lock device

Details Key and lock device Key and lock device

2006-08-29

2006-08-29

Arani, Taghi (Department: 2131)

Cryptography

Communication system using cryptography

Symmetric key cryptography

C340S005100, C340S005600, C340S005700, C340S005740, C340S500000, C340S870030, C235S382000, C713S168000, C713S171000, C713S172000, C713S173000

Reexamination Certificate

active

07099474

ABSTRACT:
A key and lock device comprises a key having a first electronic circuit and a lock having a second electronic circuit. The key and the lock store secret information, some of which is unique for each device. The key and the lock exchange a random number through connectors and perform a calculation in the respective circuitry based on the random number and secret information. An electrical blocking mechanism is moved to a non-blocking position if a comparison of the calculations in the circuits gives the correct result.

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