Method and means for securing the distribution of encoding keys Patent #: 4288659
ApplicationNo. 06/312705 filed on 10/19/1981
US 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 Firm
International 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.