Blackberry Enterprise Server 4.1 Administratiehandleiding - Pagina 12

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Administration Guide

Request source

BlackBerry® Infrastructure

BlackBerry® Provisioning System

administration web site

Authenticating requests for wireless software upgrades

Before the BlackBerry® Infrastructure sends data about a wireless software upgrade to a BlackBerry device, it performs the

following actions:

•

generates an ECDSA key periodically, using ECC over a 521-bit curve

•

signs the ECDSA key, using a stored root certificate

•

signs the software upgrade data using the digitally signed ECDSA key

When the BlackBerry device receives the data, it performs the following actions:

•

decrypts the ECDSA key, using a public key common to all BlackBerry devices that support wireless software upgrades

•

verifies the digital signature on the ECDSA key, using a stored root certificate

During the software upgrade process, security features of the BlackBerry® device components are designed to protect the

BlackBerry® Device Software from an attack by a user with malicious intent. Each time a user turns on the BlackBerry device,

specific components on the BlackBerry device are designed to automatically check the authenticity of the operating system

and the integrity of the BlackBerry Device Software. The BlackBerry Device Software must pass these security tests before

the user can run the applications on the BlackBerry device and before the wireless software upgrades can update the

applications successfully.

Description of authentication method

The BlackBerry device is designed to use digital signature validation to

authenticate the following types of data:

•

control messages that the BlackBerry device receives from the BlackBerry

Infrastructure or the administration site that requests the wireless software

upgrade

•

upgrade instructions that the BlackBerry device requests and receives from

the BlackBerry Infrastructure or the administration site that sends the

wireless software upgrade

Protecting wireless software upgrades