Access control
June 4, 2013. 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 References 3906460 Portable electronic transaction device and system therefor IC card and an identification system thereof Electronic lock system Integral door light with glazing stop Integrated circuit with an access-controlled data memory Method and apparatus for the identification of personnel Portable electronic device for use in conjunction with a screen Patent #: 5136644 InventorAssigneeApplicationNo. 072617 filed on 06/04/1993US Classes:713/184, PIN/password generator device380/46, Nonlinear (e.g., pseudorandom)705/72Verifying PINExaminersPrimary: Cain, DavidAttorney, Agent or FirmForeign Patent References
International ClassH04L 001/00Foreign Application Priority Data1992-06-10 GBAbstractA plurality of portable tokens are issued e.g. for authenticating instructions within an electronic banking network. Each token requires entry of a respective password in order to operate and becomes locked if a number of incorrect password entries are made. Each token also stores a respective cryptographic key and a random number generator. In order to unlock a locked token it outputs a random number and also encrypts that number under its respective key but does not output the result of the encryption. The random number is transmitted by the user to a central authority which stores the keys for all tokens. The authority encrypts that number under the respective key and returns the result of the encryption to the user of the token. The returned number is entered into the token and if it agrees with the result of the internal encryption the token is unlocked.Field of SearchNonlinear (e.g., pseudorandom) | |
