Mobitex Case Study Research in Motion s (RIM s) Blackberry in C#

Recognizing UPC-A in C# Mobitex Case Study Research in Motion s (RIM s) Blackberry

Mobitex Case Study Research in Motion s (RIM s) Blackberry
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One of the most interesting applications for Mobitex wireless data networks has been the Blackberry wireless e-mail pager offered by Canadian-based Research in Motion (RIM) These interactive two-way pagers were first introduced in North America in the late 1990s and have quickly grown to become a necessary wireless tool for mobile executives Figure 6-4 displays the growth in RIM users in 2001 Operating on 900 MHz Mobitex networks in North America, these devices can send and receive e-mail messages sent to a normal business user s wired e-mail inbox (see the following illustration of RIM devices) In addition to the models offered by RIM, Compaq and AOL also offer their own branded RIM devices These devices are displayed in the following illustration
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6 Introduction to Wireless Data Networks
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RIM 850
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RIM 957
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Figure 6-4 Blackberry subscribers from 2001 through 2002
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RIM devices utilize a simple hardware architecture They utilize a traditional 32-bit Intel 386 processor and contain 2MB of flash memory and up to 304Kb of static RAM (SRAM) This enables the storage of hundreds of messages and entries on a single device One of the main reasons for RIM s success has been its security model RIM s detailed security architecture has enabled RIM to overcome security objections from enterprise customers In the process, this has helped RIM devices become some of the first supported wireless data devices in the enterprise RIM s most significant benefit is its tight compatibility with existing e-mail systems An RIM device is essentially just an e-mail application that happens to exist in a wireless form factor Unlike other wireless devices that focus on other applications such as addresses, contacts, memos, and so on, RIM focuses exclusively on corporate e-mail systems
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Part 2 Wireless Technologies and Applications
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like Microsoft Outlook and Lotus cc:Mail In the process, RIM pagers essentially function as proxies for a user s PC-based e-mail account When the RIM device is not connected to a PC, messages sent to the user s email account are automatically forwarded to the user s RIM device This design, coupled with the increasing importance of e-mail, has helped RIM devices achieve high deployment within the enterprise
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RIM Security Architecture
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RIM s e-mail solution consists of two basic components: the hand-held device and e-mail redirector software The redirector software is available in two modes: desktop or server In the desktop redirector, RIM software is installed on the user s PC This software communicates with the corporate e-mail server When the RIM is not connected to the PC (via its docking cradle) and an incoming e-mail message arrives, the RIM PC retrieves, compresses, encrypts, and redirects the message to the user s RIM handheld (see Figure 6-5) The model enables the end-to-end encryption of e-mail messages from the PC to the handheld During the installation of the RIM desktop redirector, a unique symmetric Triple DES (TDES) key is created This key is then transferred to the RIM handheld via the protected serial port link between the PC and the handheld The desktop redirector encrypts all messages with this symmetric key Because the handheld has a copy of the symmetric key, it can decrypt the message at the device This sym-
Figure 6-5 RIM desktop redirection
Desktop with Blackberry Redirector
Internet Mobile Network
RIM Handheld
Mail Server
Firewall
6 Introduction to Wireless Data Networks
metric key model also prevents potential attacks against an individual PC (for example, hijacking someone s e-mail account and forwarding messages to another location) because the hacker must have knowledge of the TDES key The desktop redirector model is illustrated in Figure 6-5 The desktop redirector model has one distinct disadvantage It requires that the user s PC be powered on and connected to the network Because of some of the obvious limitations of this approach, RIM offers a serverbased redirection architecture (see Figure 6-6) In server redirection, the same basic model applies as with the desktop, except that the user s PC does not need to be on or connected to the network for messages to be received on the user s RIM handheld Instead of the desktop redirecting e-mail to the handheld, the Blackberry Enterprise Server automatically redirects the e-mail to the user s handheld The same symmetric key setup in the desktop model applies in server redirection Users create the TDES symmetric key during initial installation This key is then shared between the handheld and the Blackberry Enterprise Server to enable end-to-end message encryption The Blackberry security model has directly contributed to RIM s success with enterprise customers in North America Furthermore, RIM has been actively seeking network partners outside of North America to offer Blackberry service in new markets RIM has partnered with British Telecom who plans to offer Blackberry service in Europe in 2002 RIM is also going to introduce the devices in Hong Kong in 2002 This will provide Blackberry users with some transatlantic roaming capabilities and add to the device s appeal RIM is also courting additional application developers for the platform and aggressively moving to supporting faster networks like GPRS in future handsets
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