Patent ID: 6337912
Filing Date: 2002-01-08
Classification: G07C

Abstract:
A method of securely transforming a data carrier remotely into a key associated with a particular object identified by object information, comprising the steps of;forming a data carrier having stored secret identification information of said data carrier that is not externally accessible and also having stored open further identification information of ssaid data carrier that is externally accessible; at a central station, storing said secret identification information in association with said open further identification information; at said central station, storing said object information and key information in association with said object information; at a remote station, retrieving said stored further identification information from said data carrier and entering said object information; at said remote station, encrypting said entered object information with said retrieved further identification information to produce first encrypted object information, and using an asymmetrical encryption/decryption process having a public encryption key and a corresponding secret decryption key stored at said central station, further encrypting said first encrypted object information to produce second encrypted object information; transmitting to said central station and receiving at said central station said second encrypted object information and said retrieved further indentification information; at said central station, decrypting said received second encrypted object information with said secret decryption key stored at said central station to recreate said first encrypted object ionformation and further decrypting said recreated first encrypted object information with said received further identification information to recreate said object information; at said central station, retrieving said secret identification information associated with said received further identification information and retrieving said key information associated with said recreated object information; at said central station, encrypting said retieved key information with said retrieved secret identification information; transmitting to said remote station and receiving at said remote station said encrypted key information; at said remote station, retrieving said stored secret identification information, decrypting said received encrypted key information with said retrieved secret identification information to recreate said key information; and storing said recreated key information in said data carrier to transform said data carrier into said key associated with said particular object.