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Computer key and computer lock system

  • US 4,800,590 A
  • Filed: 01/14/1985
  • Issued: 01/24/1989
  • Est. Priority Date: 01/14/1985
  • Status: Expired due to Fees
First Claim
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1. A system for remote access by a user to a computer, which comprises a plurality of password generators, each user having one of the password generators, an interface remotely accessible by the user and connected to said computer, means for loading equivalent information into one of the password generators and the interface for generation of the passwords, said interface and said password generators each including a clock, said interface and said password generators each including means for generating the same passwords from the equivalent information at corresponding clock time periods in said one password generator and said interface using the equivalent information and an input from said clock as data to generate the same passwords in said one password generator and said interface, with the passwords changing for each successive time period, said interface including means for comparing a transmitted password generated by said one password generator during the clock time period with a password generated by said interface during the clock time period, so that identity of the transmitted password generated by said one password generator during the clock time period with the password generated by said interface allows access to said computer through said interface, and for comparing the transmitted password generated by said password generator with the changed passwords generated by said interface for a plurality of adjacent time periods in the absence of identity between the compared passwords generated by said one password generator and said interface, to compensate for non-coincidence of the clock time periods of generation of the compared passwords.

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