David A Jacobson

US Patent:

20110305333, Dec 15, 2011

Filed:

Jun 9, 2011

Appl. No.:

13/157048

Inventors:

David M. JACOBSON - San Diego CA, US
Lu Xiao - San Diego CA, US
David J. Julian - San Diego CA, US
Zhanfeng Jia - Belmont CA, US
Brian M. Buesker - San Diego CA, US
Vito R. Bica - Poway CA, US
Edward H. Teague - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04L 9/14

US Classification:

380 44

Abstract:

One feature provides a method for a client node to establish a session key with a group node by obtaining an epoch identity value associated with a current epoch, wherein obtaining the epoch identity value includes one of computing the epoch identity value based on a node real time or negotiating the epoch identity value with the group node, computing a restricted key using a shared secret key, the epoch identity value, and a group node identity associated with the group node, and executing a session key establishment protocol with the group node to derive the session key using the restricted key as a master key in the session key establishment protocol. The session key may be established between the group node and the client node even though communications between the group node and the central node is only intermittently available during the current epoch.

US Patent:

20130073598, Mar 21, 2013

Filed:

Feb 6, 2012

Appl. No.:

13/367322

Inventors:

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

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

G06F 7/58
G06F 21/00

US Classification:

708252, 708250, 713194

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.

US Patent:

20140067890, Mar 6, 2014

Filed:

Sep 4, 2012

Appl. No.:

13/602776

Inventors:

Xiaochun Zhu - San Diego CA, US
Wenqing Wu - San Digeo CA, US
David M. Jacobson - San Diego CA, US
Seung H. Kang - San Diego CA, US
Kendrick H. Yuen - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

G06F 7/58

US Classification:

708250

Abstract:

Embodiments of the disclosure are directed to generating a random number. An embodiment of the disclosure passes a current from a read operation through a magnetic tunnel junction (MTJ) to cause a first magnetization orientation of a free layer to switch to a second magnetization orientation, the switch in magnetization orientation causing a change in a resistance of the MTJ, and periodically samples the resistance of the MTJ to generate a bit value for the random number.

US Patent:

20160330020, Nov 10, 2016

Filed:

May 6, 2015

Appl. No.:

14/705686

Inventors:

- San Diego CA, US
David Jacobson - San Diego CA, US

International Classification:

H04L 9/06
G06F 7/48

Abstract:

One feature pertains to an electronic device that includes a memory circuit and a processing circuit. The processing circuit computes a scalar multiplication output Z where Z=kP by receiving an input multiplier k and a base P, and adds a modifier s to the input multiplier k to generate k′. The processing circuit also computes an intermediate scalar multiplication output Z′ where Z′=k′P by using a digit expansion of k′ that includes a sequence of digits kbelonging to a digit set D. Additionally, the processing circuit subtracts sP from Z′ to obtain the scalar multiplication output Z if k′ is odd or subtracts (s+1)P from Z′ to obtain the scalar multiplication output Z if k′ is even. The scalar multiplier output Z may be used in a cryptographic security algorithm to secure data.

US Patent:

20160306976, Oct 20, 2016

Filed:

Apr 15, 2015

Appl. No.:

14/687783

Inventors:

- San Diego CA, US
David Merrill Jacobson - San Diego CA, US

International Classification:

G06F 21/57
G06F 21/51
H04L 9/32
G06F 21/44

Abstract:

A first time software is loaded for execution by a device, the software stored in non-secure storage is authenticated. Authenticating the software may involve a cryptographic operation over the software and a digital signature of the software. A verification tag may be generated for the software if authentication of the software is successful, the verification tag based on the software and at least a device-specific secret data. The verification tag may be stored within the device. Each subsequent time the software is loaded for execution it may be verified (not authenticated) by using the verification tag to confirm that the software being loaded is the same as the one used to generate the verification tag while avoiding authentication of the software.

US Patent:

20160149712, May 26, 2016

Filed:

Jan 29, 2016

Appl. No.:

15/011255

Inventors:

- San Diego CA, US
David M. Jacobson - San Diego CA, US
Yafei Yang - Escondido CA, US
Adam J. Drew - Oceanside CA, US
Brian Marc Rosenberg - San Diego CA, US

International Classification:

H04L 9/32
H04L 29/06

Abstract:

An authentication device is provided that authenticates an electronic device based on the responses from distinct types of physically unclonable functions. The authentication device receives a device identifier associated with the electronic device. It then sends one or more challenges to the electronic device. In response, the authentication device receives one or more responses from the electronic device, the one or more responses including characteristic information generated from two or more distinct types of physically unclonable functions in the electronic device.

US Patent:

20150207624, Jul 23, 2015

Filed:

Jan 22, 2014

Appl. No.:

14/161185

Inventors:

- San Diego CA, US
Xu Guo - San Diego CA, US
Brian Marc Rosenberg - San Diego CA, US
David Merrill Jacobson - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

H04L 9/08
G06F 21/57

Abstract:

One feature pertains to a method for extracting a secret key during a secure boot flow of an integrated circuit. Specifically, the secure boot flow includes powering ON a first volatile memory circuit to generate a plurality of initial logical state values, deriving secret data based on the plurality of initial logical state values, storing the secret data in a secure volatile memory circuit that is secured by a secure execution environment (SEE), clearing the plurality of initial logical state values in the first volatile memory circuit, executing a cryptographic algorithm at the SEE to extract a secret key based on the secret data, and storing the secret key in the secure volatile memory circuit. The secure boot flow controls access to the first volatile memory circuit to secure the secret data and the plurality of initial logical state values from the insecure applications.

US Patent:

20150101037, Apr 9, 2015

Filed:

Oct 3, 2013

Appl. No.:

14/045740

Inventors:

- San Diego CA, US
Xu Guo - San Diego CA, US
David Merrill Jacobson - San Diego CA, US
Brian Marc Rosenberg - San Diego CA, US
Adam John Drew - San Diego CA, US

Assignee:

QUALCOMM Incorporated - San Diego CA

International Classification:

G06F 21/44

US Classification:

726 16

Abstract:

A method is provided for using obtaining a reproducible device identifier from a physically unclonable function. An authentication device may receive a first physically unclonable function (PUF) dataset from the electronic device, the first PUF dataset including characteristic information generated from a physically unclonable function in the electronic device. The authentication device may then identify a pre-stored PUF dataset corresponding to the electronic device. Authentication of the electronic device may be performed by correlating the pre-stored PUF dataset and the first PUF dataset for the electronic device, wherein such correlation is based on a pattern or distribution correlation the pre-stored PUF dataset and the first PUF dataset. Because such correlation is performed on datasets, and not individual points, systematic variations can be recognized by the correlation operation leading to higher correlation than point-by-point comparisons.