公开(公告)号：US20210218554A1

公开(公告)日：2021-07-15

申请号：US16760532

申请日：2018-01-02

Applicant: Hewlett-Packard Development Company, L.P.

Inventor： Helen Balinsky ,  Chris Dalton ,  Joshua Serratelli Schiffman

IPC: H04L9/08 ,  H04L9/32

Abstract: A method for regulating modification of a distributed digital ledger at a node comprises controlling access to a cryptographic key used to enable modification of the distributed digital ledger according to a policy maintained by at least one owner of the distributed digital ledger.

公开(公告)号：US11356249B2

公开(公告)日：2022-06-07

申请号：US16760532

申请日：2018-01-02

Applicant: Hewlett-Packard Development Company, L.P.

Inventor： Helen Balinsky ,  Chris Dalton ,  Joshua Serratelli Schiffman

IPC: H04L9/08 ,  H04L9/32

Abstract: A method for regulating modification of a distributed digital ledger at a node comprises controlling access to a cryptographic key used to enable modification of the distributed digital ledger according to a policy maintained by at least one owner of the distributed digital ledger.

公开(公告)号：US11119947B2

公开(公告)日：2021-09-14

申请号：US16606955

申请日：2017-10-30

Applicant: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.

Inventor： Maugan Villatel ,  Chris Dalton ,  Carey Huscroft

IPC: G06F13/28 ,  G06F12/14 ,  G06F21/57 ,  G06F21/78

Abstract: A method for secure hardware initialization during a start-up process comprises activating a protected portion of a physical memory, allocating a part of the protected portion of the physical memory for use by direct memory access, DMA, drivers and non-DMA related hardware initialization instructions, and using a memory management tool, allocating a first part of the physical memory, accessible by a device via the memory management tool, for use by data.

公开(公告)号：US20210034764A1

公开(公告)日：2021-02-04

申请号：US16980046

申请日：2018-04-24

Applicant: Hewlett-Packard Development Company, L.P.

Inventor： Helen Balinsky ,  Alberto Such Vicente ,  Chris Dalton ,  Remy Husson

IPC: G06F21/60 ,  G06F3/12 ,  H04L9/32

Abstract: In an example, print apparatus comprises a security services engine to perform cryptographic services. The security services engine may receive a request for a cryptographic service and validate that the request is an authorised request. On successful validation, the security services engine may perform the cryptographic service by acquiring a first key, acquire an associated first key identifier and may output the first key identifier.