Blackberry ENTERPRISE SOLUTION SECURITY - SECURITY FOR DEVICES WITH BLUETOOTH WIRELESS TECHNOLOGY - TECHNICAL Uživatelský manuál stáhnout pdf (Strana 80)

Message attachment process flows

Process flow: Viewing a message attachment

1. A user receives a message with an attachment on a BlackBerry® device.

2. The BlackBerry Messaging Agent verifies that the format of the attachment is valid for conversion.

If the format is not valid and the user’s BlackBerry device is Java® based, the Open Attachment menu item does not appear

on the user’s BlackBerry device.

3. The user clicks the Open Attachment menu item to view the attachment on the BlackBerry device.

4. The attachment viewer sends the request to the BlackBerry Messaging Agent.

5. The BlackBerry Messaging Agent connects to the BlackBerry Attachment Service over port 1900.

6. The BlackBerry Attachment Service retrieves the attachment in binary format from the user’s message store using the

BlackBerry Messaging Agent link to the messaging server.

The BlackBerry Attachment Service distills the attachment and extracts the content, layout, appearance, and navigation

information from the attachment.

The BlackBerry Attachment Service organizes, stores, and links the information in a proprietary DOM in a binary XML style.

The BlackBerry Attachment Service formats the attachment for the BlackBerry device and converts it to UCS format. The

formatting is based on the request for content (for example, page and paragraph information, or search words) and the

available BlackBerry device information (for example, screen size, display, or available space).

The BlackBerry Attachment Service sends the UCS data to the BlackBerry Messaging Agent using a TCP/IP connection

over port 1900.

7. The BlackBerry Messaging Agent sends the converted attachment to the BlackBerry Dispatcher.

8. The BlackBerry Dispatcher compresses the first portion of the attachment, encrypts it using the master encryption key of

the BlackBerry device, and sends the first portion of the attachment to the BlackBerry Router.

Feature and Technical Overview

Message attachment process flows

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Blackberry ENTERPRISE SOLUTION SECURITY - SECURITY FOR DEVICES WITH BLUETOOTH WIRELESS TECHNOLOGY - TECHNICAL Uživatelský manuál Strana 80