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:
Nov. 13, 2018
Filed:
Mar. 14, 2013
Emc Ip Holding Company Llc, Hopkinton, MA (US);
Nikolaos Triandopoulos, Arlington, MA (US);
Marten van Dijk, Somerville, MA (US);
John Brainard, Sudbury, MA (US);
William M. Duane, Westford, MA (US);
EMC IP Holding Company LLC, Hopkinton, MA (US);
Abstract
Methods and apparatus are provided for randomizing state transitions for one-time authentication tokens. A user authentication passcode is generated by determining a generation time within an epoch for initiating computation of the user authentication passcode; initiating computation of the user authentication passcode at the determined generation time; and presenting the user authentication passcode at a presentation time that is de-coupled from the generation time. The generation time occurs, for example, at a random offset from a start of the epoch. A time difference between the presentation time and a completion of the computation of the user authentication passcode comprises, e.g., a uniformly distributed random variable over a range of values having a finite mean value. The epoch optionally comprises pre-computation epochs and a variable number of user authentication passcodes are optionally computed during a given pre-computation epoch. The number of passcodes generated per epoch can be varied in a random manner.