From: Subject: Online File W5.6 Date: Mon, 28 May 2007 08:32:13 +0430 MIME-Version: 1.0 Content-Type: multipart/related; type="text/html"; boundary="----=_NextPart_000_000F_01C7A102.B0C81E60" X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 This is a multi-part message in MIME format. ------=_NextPart_000_000F_01C7A102.B0C81E60 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Location: http://higheredbcs.wiley.com/legacy/college/turban/0471705225/web/online/ch05/w5_6.html Online File W5.6

Online File W5.6=20


SECURITY APPROACHES FOR MOBILE COMPUTING=20

SIM-BASED AUTHENTICATION=20

GSM and its 2.5G and 3.0G counterparts all include SIM (see section = 5.2).=20 This module is usually implemented as a smart card containing an = authentication=20 key along with other vital information about the subscriber. The = authentication=20 key is also stored on a =93home location registry,=94 which can be = thought of as a=20 database that is part of the mobile (GSM) network. When the phone is = turned on,=20 the user is asked to enter a PIN number. This protects the cell phone = against=20 illegal use if it happens to be stolen or lost. If the PIN is correct, = the cell=20 phone and the network engage in a =93challenge-response=94 process of=20 authentication. A network authentication center sends a random number to = the=20 cell phone=92s SIM. The SIM computes a =93signed response=94 by = combining the random=20 number with its authentication key. The signed response is sent over the = network=20 to the authentication center, which performs the same computation using = a copy=20 of the authentication key stored on the home-location registry. If the = signed=20 response matches the value computed by the authentication center, then = the cell=20 phone is authenticated. After that, communication takes place through = =93symmetric=20 encryption,=94 using a key generated by both the authentication center = and the=20 SIM.

While SIM cards protect against unauthorized use of a = particular=20 subscriber=92s account, they do not prevent the use of a stolen cell = phone. If a=20 thief steals a phone, he or she can simply replace the existing SIM card = with=20 another one and sell it on the open market. The police in Amsterdam = employed an=20 interesting method to thwart this practice. Using a cell phone=92s = International=20 Mobile Equipment Identity number, the police were able to track down the = mobile=20 phone number being used on the stolen phone. Once the number was known, = the=20 police employed a special computer program to send out an SMS message to = the=20 stolen phone every three minutes. The message read, =93This handset was = nicked=20 [stolen]; buying or selling it is a crime. The Police.=94 Obviously, = this made the=20 stolen phone a lot less attractive to prospective buyers (Evers, 2001).=20

THE WAP=20

In spite of its shortcomings, Wireless Application Protocol (WAP) = has become=20 the de facto standard for delivering Web content to mobile devices. An=20 organization named The WAP Forum originated WAP. It was the joint effort = of=20 companies like Ericsson, Nokia, and Motorola. Recently, the WAP Forum = merged=20 with Open Mobile Architecture Initiative to become the Open Mobile = Alliance Ltd=20 (openmobilealliance.org). It is the alliance that is responsible = for=20 specifying the WAP standards.

Figure W5.6.1 provides a = high-level=20 overview of the WAP architecture. In this architecture there are two = servers=97a=20 WAP gateway and a Web server. Basically, the WAP gateway receives = a=20 request from a mobile device via a communications tower, translates it = into a=20 form that is understandable by a Web server, and passes it on through = the wired=20 Internet to the appropriate Web server. In turn the Web server = passes the=20 response back to the WAP gateway, which translates it into a form that = is=20 understandable by the mobile device. The translated communication is = then sent=20 to the communication tower and back to the mobile device. =20

WTSL AND WIM=20

The transmissions between the WAP gateway and the Web server can be = secured=20 through the wired Internet security protocols discussed in Chapter 4 = (e.g., PKI,=20 SSL, and TSL). These protocols cannot be used on the mobile side of the = gateway.=20 Instead, WAP relies on the Wireless Transport Layer Security = (WTLS). Like=20 its wired counterpart (TSL), WTLS enables encrypted communications = between a=20 mobile device and the WAP gateway. Additionally, WTLS supports the key = elements=20 of PKI=97public and private encryption keys, digital certificates, = digital=20 signatures, and the like.

A wireless identity module = (WIM) can=20 also be used in combination with WTLS. A WIM is a smartcard device, much = like a=20 SIM (and in fact can be implemented on a SIM). It is designed to hold = the=20 security keys and digital certificates used by the gateway and the Web = server to=20 encrypt/decrypt communications. One of the advantages of a WIM is that = can be=20 issued by a bank or other financial institution to handle m-commerce = payments=20 and transactions.



REFERENCE FOR ONLINE FILE W5.6=20

Evers, J., =93Dutch Police Fight Cell Phone Theft with SMS Bombs,=94 = IDG News=20 Service, March 27, 2001,=20 idg.net/idgns/2001/03/27/DutchPoliceFightsCellPhoneTheft. shtml = (accessed=20 May 2004).

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