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. 14, 2015
Filed:
Dec. 27, 2012
Emc Corporation, Hopkinton, MA (US);
Marten van Dijk, Somerville, MA (US);
Nikolaos Triandopoulos, Arlington, MA (US);
Ari Juels, Brookline, MA (US);
Ronald Rivest, Arlington, MA (US);
EMC Corporation, Hopkinton, MA (US);
Abstract
Methods and apparatus are provided for generation of forward secure pseudorandom numbers that are resilient to such forward clock attacks. A forward secure pseudorandom number is generated by obtaining a first state scorresponding to a current leaf node νin a hierarchical tree, wherein the current leaf νproduces a first pseudorandom number r; updating the first state sto a second state scorresponding to a second leaf node ν; and computing a second pseudorandom number rcorresponding to the second leaf node ν, wherein the second pseudorandom number ris based on a forward clock reset index that identifies an instance of the hierarchical tree, wherein the instance of the hierarchical tree is incremented when one or more criteria indicating a forward clock attack are detected. The forward clock reset index can be encoded in a forward secure manner in the hierarchical tree.