The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 19, 2011
Filed:
Dec. 13, 2007
Andrey Jivsov, Mountain View, CA (US);
Andrey Jivsov, Mountain View, CA (US);
Symantec Corporation, Cupertino, CA (US);
Abstract
Computer readable storage medium, computer-implemented method, and computer system for identifying substring repetition in a pass phrase. A sub-string index is generated. The number of bits required to represent each character in the pass phrase is determined. An entropy value is assigned to each character in the pass phrase in accordance with a probability function that assigns highest probabilities at boundaries of an interval for the entropy of a character, or that assigns lowest probabilities when a ratio of a number of pass phrase characters to pass phrase length is equal to a ratio of a size the interval to a sum of interval sizes. A total entropy value for the pass phrase is computed to provide an indication of pass phrase quality.