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. 17, 2015
Filed:
Feb. 06, 2012
David M. Jacobson, San Diego, CA (US);
Xiaochun Zhu, San Diego, CA (US);
Wenqing Wu, Carlsbad, CA (US);
Kendrick Hoy Leong Yuen, San Diego, CA (US);
Seung H. Kang, San Diego, CA (US);
David M. Jacobson, San Diego, CA (US);
Xiaochun Zhu, San Diego, CA (US);
Wenqing Wu, Carlsbad, CA (US);
Kendrick Hoy Leong Yuen, San Diego, CA (US);
Seung H. Kang, San Diego, CA (US);
QUALCOMM Incorporated, San Diego, CA (US);
Abstract
An entropy source and a random number (RN) generator are disclosed. In one aspect, a low-energy entropy source includes a magneto-resistive (MR) element and a sensing circuit. The MR element is applied a static current and has a variable resistance determined based on magnetization of the MR element. The sensing circuit senses the resistance of the MR element and provides random values based on the sensed resistance of the MR element. In another aspect, a RN generator includes an entropy source and a post-processing module. The entropy source includes at least one MR element and provides first random values based on the at least one MR element. The post-processing module receives and processes the first random values (e.g., based on a cryptographic hash function, an error detection code, a stream cipher algorithm, etc.) and provides second random values having improved randomness characteristics.