Browse Prior Art Database

PARALLEL PROCESSING OF ENCRYPTION SERVICES

IP.com Disclosure Number: IPCOM000009634D
Original Publication Date: 2000-Jan-01
Included in the Prior Art Database: 2002-Sep-05
Document File: 1 page(s) / 49K

Publishing Venue

Motorola

Related People

Bhavesh S. Shah: AUTHOR [+3]

Abstract

In an ASTRO 25 Over The Air Rekeying (OTAR) system, the Key Management Facility (KMF) manages and distributes keys to all the secure units in the system. Keys are encrypted and sent over the air in the form of Key Management Messages (KMMs).

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PARALLEL PROCESSING OF ENCRYPTION SERVICES

by Bhavesh S. Shah, Ferdinand Brillantes and Brett Szudy

BACKGROUND

  In an ASTRO 25 Over The Air Rekeying (OTAR) system, the Key Management Facility (KMF) manages and distributes keys to all the secure units in the system. Keys are encrypted and sent over the air in the form of Key Management Messages (KMMs).

  When a Digital Interface Unit (DIU) Encryption Module receives a KMM, it may need to perform the following operations per KMM:

l Message Authentication Code (MAC) Validation

l Response Message Authentication Code generation

l Response Outer Layer Encryption

PROBLEM

  Each of the previous operation involves some kind of encryption and hence it will be a very time consuming task to service the entire KMM.

SOLUTION

  Currently, the DIU EMC has two Key Generator (KG) pairs to allow full duplex voice operation. If we use both these KG pairs simultaneously to per- form two of the operations above in parallel, we could significantly decrease the overall KMM pro- cessing time. For example, after the KMM is Outer Layer Decrypted, the MAC validation and the Inner Layer Decryption can be performed in parallel to speed up the processing of KMM. Similarly, the MAC generation and Outer Layer Encryption of the response can be performed in parallel too.

  In systems today, voice typically has priority over OTAR. So the key advantage of using the KGs in this manner is that in busy voice systems, there is a better chance of servicing the KM...