Dale W Hopkins

US Patent:

7093133, Aug 15, 2006

Filed:

Dec 20, 2001

Appl. No.:

10/037238

Inventors:

Dale W. Hopkins - Georgetown KY, US
Thomas W. Collins - Saratoga CA, US
Steven W. Wierenga - Sunnyvale CA, US

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

G06F 11/30

US Classification:

713176, 713186

Abstract:

A method is provided for generating a group digital signature wherein each of a group of individuals may sign a message M to create a group digital signature S, wherein M corresponds to a number representative of a message, 0≦M≦n−1, n is a composite number formed from the product of a number k of distinct random prime factors pp. . . p, k is an integer greater than 2, and S≡M(mod n). The method may include: performing a first partial digital signature subtask on a message M using a first individual private key to produce a first partial digital signature S; performing at least a second partial digital signature subtask on the message M using a second individual private key to produce a second partial digital signature S; and combining the partial digital signature results to produce a group digital signature S.

US Patent:

7231040, Jun 12, 2007

Filed:

Oct 26, 1998

Appl. No.:

09/328726

Inventors:

Thomas Collins - Saratoga CA, US
Dale Hopkins - Gilroy CA, US
Susan Langford - Sunnyvale CA, US
Michael Sabin - Sunnyvale CA, US

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

H04K 1/00
H04L 9/00

US Classification:

380 28, 713200

Abstract:

A method and apparatus are disclosed for improving public key encryption and decryption schemes that employ a composite number formed from three or more distinct primes. The encryption or decryption tasks may be broken down into sub-tasks to obtain encrypted or decrypted sub-parts that are then combined using a form of the Chinese Remainder Theorem to obtain the encrypted or decrypted value. A parallel encryption/decryption architecture is disclosed to take advantage of the inventive method.

US Patent:

7318160, Jan 8, 2008

Filed:

Feb 1, 2002

Appl. No.:

10/062808

Inventors:

Dale W. Hopkins - Georgetown KY, US
Thomas W. Collins - Saratoga CA, US
Steven W. Wierenga - Sunnyvale CA, US

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

H04L 9/00
H04K 1/00

US Classification:

713189, 380 28

Abstract:

A method is disclosed for performing cryptographic tasks, that include key setup tasks and work data processing tasks. This method comprises the steps of processing the key data in a first cryptographic engine and processing the work data in a second cryptographic engine. The processing of the key data comprises the steps of receiving key data, processing the key data, and generating processed key data. The processing of the work data comprises the steps of receiving the processed key data, receiving work data, processing the work data, and outputting the processed work data. In this method of the invention, the first cryptographic engine performs its tasks independently of the second cryptographic engine. A method for allocating cryptographic engines in a cryptographic system is also disclosed comprising monitoring a queue of cryptographic tasks, monitoring activity levels of a first allocation of a plurality of cryptographic engines, and dynamically adjusting the first allocation.

US Patent:

7392384, Jun 24, 2008

Filed:

Jun 28, 2002

Appl. No.:

10/187266

Inventors:

Dale W. Hopkins - Georgetown KY, US
Susan Langford - Sunnyvale CA, US
Larry Hines - Santa Clara CA, US
Ching-Hsuan Chen - Fremont CA, US

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

H04L 9/00

US Classification:

713168, 713181, 380 44, 380255, 380277, 380278, 380280

Abstract:

A system and method are described supporting secure implementations of 3DES and other strong cryptographic algorithms. A secure key block having control, key, and MAC fields safely stores or transmits keys in insecure or hostile environments. The control field provides attribute information such as the manner of using a key, the algorithm to be implemented, the mode of use, and the exportability of the key. A MAC algorithm is applied across the key and control for generating a MAC field that cryptographically ties the control and key fields together. Improved security is provided because tampering with any portion of the key block results in an invalid key block. The work factor associated with any manner of attack is sufficient to maintain a high level of security consistent with the large keys and strong cryptographic algorithms supported.

US Patent:

RE40530, Oct 7, 2008

Filed:

Oct 20, 2000

Appl. No.:

09/694416

Inventors:

Thomas Collins - Saratoga CA, US
Dale Hopkins - Gilroy CA, US
Susan Langford - Sunnyvale CA, US
Michael Sabin - Sunnyvale CA, US

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

H04L 9/30
H04L 9/00

US Classification:

380 30, 380 29

Abstract:

A method and apparatus are disclosed for improving public key encryption and decryption schemes that employ a composite number formed from three or more distinct primes. The encryption or decryption tasks may be broken down into sub-tasks to obtain encrypted or decrypted sub-parts that are then combined using a form of the Chinese Remainder Theorem to obtain the encrypted or decrypted value. A parallel encryption/decryption architecture is disclosed to take advantage of the inventive method. REEXAMINATION RESULTS.

US Patent:

7660421, Feb 9, 2010

Filed:

Jun 28, 2002

Appl. No.:

10/187404

Inventors:

Dale W. Hopkins - Georgetown KY, US
Susan Langford - Sunnyvale CA, US
Larry Hines - Santa Clara CA, US
Ching-Hsuan Chen - Fremont CA, US

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

H04L 9/00

US Classification:

380277, 380 44, 380280, 380281, 726 5, 726 30, 713161, 713168, 713169, 713181, 713187

Abstract:

A system and method are described supporting secure implementations of 3DES and other strong cryptographic algorithms. A secure key block having control, key, and hash fields safely stores or transmits keys in insecure or hostile environments. The control field provides attribute information such as the manner of using a key, the algorithm to be implemented, the mode of use, and the exportability of the key. A hash algorithm is applied across the key and control for generating a hash field that cryptographically ties the control and key fields together. Improved security is provided because tampering with any portion of the key block results in an invalid key block. The work factor associated with any manner of attack is sufficient to maintain a high level of security consistent with the large keys and strong cryptographic algorithms supported.

US Patent:

8135132, Mar 13, 2012

Filed:

Dec 23, 2009

Appl. No.:

12/645516

Inventors:

Dale W. Hopkins - Georgetown KY, US
Susan Langford - Sunnyvale CA, US
Larry Hines - Santa Clara CA, US
Ching-Hsuan Chen - Fremont CA, US

Assignee:

Hewlett-Packard Development Company, L.P. - Houston TX

International Classification:

H04L 9/28
H04L 9/00

US Classification:

380 44, 380 28, 380277, 380280, 380286, 713168, 713181

Abstract:

A system and method are described supporting secure implementations of 3DES and other strong cryptographic algorithms. A secure key block having control, key, and hash fields safely stores or transmits keys in insecure or hostile environments. The control field provides attribute information such as the manner of using a key, the algorithm to be implemented, the mode of use, and the exportability of the key. A hash algorithm is applied across the key and control for generating a hash field that cryptographically ties the control and key fields together. Improved security is provided because tampering with any portion of the key block results in an invalid key block. The work factor associated with any manner of attack is sufficient to maintain a high level of security consistent with the large keys and strong cryptographic algorithms supported.

US Patent:

20020041683, Apr 11, 2002

Filed:

Sep 27, 2001

Appl. No.:

09/967425

Inventors:

Dale Hopkins - Gilroy CA, US
Tom Collins - Saratoga CA, US

International Classification:

H04K001/00

US Classification:

380/028000

Abstract:

A method provided for determining an optimal number k of prime factors p, p, . . . pfor developing a modulus N for use in a cryptographic system providing computational performance that increases as the number of constituent prime factors of the modulus increases, wherein use of the optimal number k of prime factors enables the system to provide optimal computational performance while maintaining a determined level of security.