Method and system for variable password access

Patent 5682475 Issued on October 28, 1997. Estimated Expiration Date:

December 30, 2014. 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.

Abstract Claims Description Full Text

Patent References

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Inventors

Application

No. 366693 filed on 12/30/1994

US Classes:

713/183Solely password entry (no record or token)

Examiners

Primary: Beausoliel, Robert W. Jr.
Assistant: Le, Dieu-Minh

Attorney, Agent or Firm

Gundel; Norman L.

International Class

G06F 011/00

Abstract

A method and system are provided for controlling access to a data processing system through the use of a variable password. In one embodiment, the invention substitutes the value of a variable into an expression contained in a predefined password, evaluates the expression and password, and compares the result of the valuation of the password to a character string input to the data processing system, granting access if they are identical. A range of values of certain characters of the password may be permitted. The password may require that certain characters be entered within a defined time interval measured from the entry of other characters. The values of environment variables, which are referenced by the variable password, may change from time to time, as a function, for example, of the current time or temperature or system utilization.

Other References

Perry, O. R., Password Verification, IBM Technical Disclosure Bulletin, 11-72, pp. 1943-1944
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Dean, M. C. et al, Method To Provide Password Security Without Storing Password, IBM Technical Disclosure Bulletin, 08-87, p. 1068
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