ALEXANDRIA, Va., June 9 -- United States Patent no. 12,289,404, issued on April 29, was assigned to Rapid7 Inc. (Boston).

"Password similarity checking using homomorphic encryption operations" was invented by Roy Hodgman (Cambridge, Mass.) and Vasudha Shivamoggi (Cambridge, Mass.).

According to the abstract* released by the U.S. Patent & Trademark Office: "Various embodiments include systems and methods to implement a password requirement conformity check. During a password reset process, a proposed password is received. A homomorphic encryption operation may be performed on the proposed password to generate a first character string. The first character string may be compared to a previous character string associated with a previous passw...