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Computer accessing system

  • US 4,310,720 A
  • Filed: 03/31/1978
  • Issued: 01/12/1982
  • Est. Priority Date: 03/31/1978
  • Status: Expired due to Term
First Claim
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1. A system for accessing a computer by a user having an assigned password to establish a communications link for data transmission between a computer terminal and a computer, the system comprising access means at the terminal for sequentially generating a pseudorandom number of a first sequence of pseudorandom numbers, means receiving said pseudorandom number and said user assigned password and in response thereto modifying the pseudorandom number as a predetermined function of the password to provide an access code signal unique to itself, means transmitting the access code signal and identification signal from the terminal, controller means at said computer, the controller means receiving the transmitted access code signal and identification signal, the controller means including means responsive to the identification signal for sequentially generating a pseudorandom number of a second sequence of pseudorandom numbers congruent with the numbers of the first sequence and generating a signal corresponding to said user assigned password, and means for modifying said pseudorandom number of the second sequence with said last mentioned signal to provide a congruent access code signal and in response to the equality of the congruent access code signal and transmitted access code signal providing an access signal, and means receiving the access signal and in response thereto establishing a data transmission path between the terminal and the computer, said first and second sequences being the same, whereby computer access is secured through a sequential change of access codes in a pseudorandom fashion without direct transmission of said user'"'"'s password.

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