Protection system for intelligent cards
Patent 4453074 Issued on June 5, 1984. Estimated Expiration Date: 
October 19, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 19, 2001. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesMethod and means for securing the distribution of encoding keys Patent #: 4288659 InventorAssigneeApplicationNo. 06/312705 filed on 10/19/1981US Classes:705/66, Intelligent token initializing or reloading235/380, Credit or identification card systems235/381, With vending235/382, Permitting access380/281, Using master key (e.g., key-encrypting-key)380/30, Public key713/173, Pre-loaded with certificate902/26, Including semiconductor chip (e.g., smart card)902/5And to verify identity of user*ExaminersPrimary: Pitts, Harold I.Attorney, Agent or FirmInternational ClassesG06F 21/00 (20060101)H04L 29/06 (20060101) G07F 7/10 (20060101) AbstractThere is disclosed a protection system for intelligent cards. Each card has stored in it a code which is the encryption of a concatenation of a user secret password and a common reference text. The encryption is derived by an initialization terminal which uses the private key associated with the public key of a public-key cryptosystem key pair. Each transaction terminal with which a card is used decrypts the stored code in accordance with the public key. A transaction is effected only if the stored code decrypts into the user password which is inputted on a keyboard and the common reference text. | |
