Dismiss
InnovationQ will be updated on Sunday, Oct. 22, from 10am ET - noon. You may experience brief service interruptions during that time.
Browse Prior Art Database

Dynamic Restore of Cryptographic Processor

IP.com Disclosure Number: IPCOM000104053D
Original Publication Date: 1993-Mar-01
Included in the Prior Art Database: 2005-Mar-18
Document File: 2 page(s) / 25K

Publishing Venue

IBM

Related People

Preston, A: AUTHOR [+3]

Abstract

Cryptographic hardware may be present on one or more CPUs in a partitioned (PR/SM) environment. Different partitions may be using the cryptographic hardware with different keys.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Dynamic Restore of Cryptographic Processor

      Cryptographic hardware may be present on one or more CPUs in a
partitioned (PR/SM) environment.  Different partitions may be using
the cryptographic hardware with different keys.

      This design describes the capability to remove the CPU, form
the configuration, and to be able to bring back the same CPU, with
its cryptographic hardware, into the system configuration and to
allow the partitions with different keys to be able to initiate and
start running on this CPU.

      The CPU in this example is powered down and repair is done
either to the CPU or the cryptographic hardware.  Once the repair is
completed, the hardware is powered up and concurrently brought back
onto the configuration with other CPU's, by LPAR Licensed Internal
Code (LIC).

      LPAR controls the saving and restoring of the cryptographic
keys when a CPU is taken offline, LPAR returns the key states, so as
to restore keys in the cryptographic hardware when the CPU is brought
online.  Similar design is done for Vector elements with affinity to
a CPU.