Wireless Security Essay Example For Students

Wireless Security Essay SECURITY OF WIRELESS COMMUNICATIONSIntroductionWireless devices, like all technologies that provide external access to corporate networks, present security challenges. With wireless standards and practices still rapidly evolving, it is important to understand the strengths and limitations of available technologies in order to implement a secure solution. Extending current security policies to encompass wireless devices requires an understanding of the security features of both wireless devices and wireless networks. Purpose of the StudyThe purpose of the study was to assist in the decision whether Lotus Development should extend current security policies to encompass wireless devices. The following are critical security questions: What challenges are faced with wireless security? How can you verify that the device being used is actually in the hands of an authorized user? How can you enhance the security of the device?How secure is the over-the-air network between the organization and the wireless device? How can you secure the wireless session?Should Lotus development include wireless devices in their security policies?Research Methods and ProceduresThrough traditional and electronic research of books, periodicals, and business journals, secondary research was conducted. Figures were constructed through extensive research and study of interactions of networks. Wireless Security ChallengesMobile devices and wireless networks rely on a broad spectrum of technology, much of it cutting-edge. In com parison to PCs, each class of mobile device currently represents a unique hardware and software platform. Mobile phones and PDAs, for example, have varying capabilities and limitations both as computing devices and as client devices accessing corporate networks. The wireless networks that support mobile devices are similarly diverse. By relying on industry standard protocols like TCP/IP, HTTP, SMTP and TAP, Mobile Services for Domino supports many of the major wireless networks currently in operation. This standards-based approach also provides MSD with a common security model that can operate across wireless networks, while at the same time taking some of the complexity out of doing business with different wireless network providers (Braden, 1997). However, it is important to understand that there is currently no industry-wide security standard that will work on every mobile device and on every wireless network, in the way that X.509 and SSL span the PC universe. MSD bridges this gap wherever possible by adding its own security features (Freeburg, 1991). Mobile Device SecurityMost mobile devices currently provide only a simple username/password combination to block use of the device (a few also offer local data encryption). And since most users do not employ even this rudimentary level of security, mobile devices like pagers, mobile phones and PDAs are essentially unsecured (Aziz, 1993). Existing PC-based security mechanisms, such as client certificates, simply dont exist yet for wireless devices. The main reason is that wireless devices currently lack the computing power necessary to validate a certificate locally. Moreover, each wireless device has its own unique hardware, operating system services and integrated application s. These factors make it difficult to create a standard local security mechanism that can work across all wireless technologies. Security, moreover, has only recently become a major concern of device vendors. This is because wireless devices have traditionally been targeted at individual users for access to their personal data not corporate data. But as mobile device usage among corporate customers increases, improved security has become a paramount requirement. As vendors address this growing need, more and more security solutions and proposed standards will emerge (Aziz, 1993). Device Security EnhancementsMSD supports the full spectrum of wireless devices: from one-way alphanumeric pagers that can receive a simple message from your Domino network; to the latest generation of Web-ready phones equipped with micro-browsers, from which users can access their Notes mail, calendar and corporate directory. Because of the great diversity of device capabilities, as well as their inherent security limitations, MSD cannot provide security for data stored locally across every device. Instead, MSD provides security for corporate data inside the firewall, by securing it against unauthorized access by wireless devices. In particular, MSD provides administrators with the ability to (Cohen, 1991): Associate a specific, authorized user with each mobile device (Trusted Devices). Specify what wireless networks can communicate with MSD (Trusted IP Addresses). Trusted DevicesMSDs Trusted Devices feature enables administrators both to know what employee is authorized to use each device, and to control the ability of each user or device to access Domino via MSD. For example, if an employee loses his or her mobile device, an administrator can immediately disable the use of that device with MSD, thus eliminating the risk that an impostor will access the network. In addition to Trusted Devices, MSD offers a related security feature called Dynamic Device/User Mapping. It works like this: the first time a user successfully enters a valid Domino HTTP username and password from a properly registered mobile device, a record is created in MSDs configuration database that maps the users fully qualified Domino username to a unique device ID (which is received from the device). By default, users can easily clear this record using their mobile devices, in order to share the device with someone else. However, administrators can choose to lock the first-time mapping between device ID and username, preventing anyone other than the original, authorized person from using the device (Banan, 1999). Trusted IP AddressesMSD enables administrators to register the IP addresses of the WAP gateways they use with MSD. Only HTTP requests from these IP addresses are permitted to use the MSD application. This effectively restricts the proxies that can access an organiz ational network (Perkins, 1996). Over-the-Air SecurityIn todays wireless world, organizations may have little control as to which wireless network its data travels over between the firewall and employees mobile devices. And while the Internet offers security standards for authentication and encryption between a remote users laptop-based Web browser and a corporate intranet, wireless networks have no analogous, universal security mechanisms. However, many operators using either Code Division Multiple Access (CDMA) or Cellular Digital Packet Data (CDPD) technology provide RSA-based encryption between the phone, cell tower and WAP gateway (Arup, 1993). Security features common to many wireless networks include the following (Freeburg, 1991): 1.RSA RC4 encryption is in effect for over-the-air transmissions between the device and the wireless network. 2.As requests from the micro-browser reach the WAP gateway over the wireless network, they are converted and passed along to the HTTP server. This transformation takes plac e in real time, using the local memory of the WAP gateway. The possibility of unauthorized access to data during this process is therefore minimal. 3.The WAP gateway can also support HTTP connections, along with various kinds of certificates. This provides enhanced security between the WAP gateway and application servers like Mobile Services for Domino. This multi-layer approach, illustrated in Figure 1, provides a secure foundation for over-the-air connections (Nichols, 1998). Figure 1: Over-the-air security in a wireless networkMSD Server SecurityAs alluded to above, the foundation for all of MSD security capabilities is Dominos integrated security services. Because MSD is a fully integrated, Domino-based solution, applicable Domino security services are available for use on the MSD server itself. For example, Domino supports port encryption via RSA RC4. As an option, the network communication between MSD and the rest of the Domino environment can be encrypted, providing an excellent way to increase security for corporate data (Davies, 1994). Not only is a MSD server as secure as any Domino server, it also enables organization s to administer MSD server security the same way all other Domino servers in the environment are managed for security purposes. Gambia EssayIn addition, you can use a third-party Certificate Authority to validate the credentials of the Internet Service Provider and their WAP gateway, and require the use of SSL for communication between the service provider and their gateway. Scenario 2Most extranet networks today that are based on Web standards employ the use of some form of DMZ, or Demilitarized Zone (also referred to as a double firewall). In this configuration, the MSD server is positioned between two corporate firewalls. One firewall, on the Internet side, should only allow traffic from specific, trusted IP addresses in to the MSD server. The other, on the Domino network side, should only allow the MSD server to communicate with specific Domino servers, via specific (and optionally encrypted) ports (Abhaya, 1994). Scenario 3In a virtual private network (VPN) environment, a leased-line T1 circuit, Frame Relay or ATM-type connection is installed directly between the Wireless Server Provider and the corporate network. This provides a more secure connection, by virtue of creating a private tunnel that bypasses the public Internet altogether. A VPN also provides a much more reliable transport because it is not dependent on the Internet for connectivity. Another benefit of private networks, such as those implemented via frame relay, is that they can be much faster than some Internet connections (Aziz, 1993). ConclusionWireless access to corporate data from mobile devices such as Web-enabled cell phones, pagers and PDAs has become a fact of corporate life. Organizations must fully understand the security implications of this type of access to keep their proprietary data secure. Mobile Services for Domino, along with the Domino Server itself, provide one of the most secure wireless access solutions available today. While there is currently no true end-to-end authentication and encryption for wireless data access as there is in the PC world, MSD addresses many of the most critical security concerns that are inherent when users access corporate and personal data from mobile devices. Key MSD security features include (Cohen, 1991): Trusted IP Addresses, enabling the MSD server to accept connections only from the IP addresses of approved wireless service providers. Trusted devices, enabling MSD to associate a specific wireless device with a specific user. Dynamic device/user mapping, which allows only an assigned, authorized user to use a specific wireless device. Username/password authentication, enabling MSD to authenticate each user for each session. Access Control List verification, which ensures that an authenticated user has the correct access permissions to access his or her Notes mailbox, before MSD sends any data. As wireless security standards emerge, networks and servers will do their best to boost security.But without the current security policies including wireless, they might go un-upgraded. ReferencesAziz, Ashar and Whitfield Diffie: Privacy and Authentication for Wireless Local Area Networks, Sun Microsystems Inc, IEEE Personnal Communications, Volume 1, Number 1, July 1993, Pages 2531. Abhaya, Asthana and Mark Cravatts and Paul Krzyzanowski: An Indoor Wireless System for Personalized Shopping Assistance, AT T Bell Laboratory, IEEE Workshop on Mobile Computing Systems and Applications, Santa Cruz, CA, US, December 1994Arup, Acharya and B. R. Badrinath: Delivering Multicast Messages in Networks with Mobile Hosts, Rutgers University, 13th International Conference on Distributed Computing Systems, Pittsburgh, US, May 1993, Pages 292299Banan, M. Nedas Efficient Mail Submission and Delivery (EMSD) Protocol Specification Version 1.3. Request for Comments (Informational) 2524, Neda Communications, Inc., February 1999. Braden, R. et al. Resource ReSerVation Protocol (RSVP) Version 1 Functional Specification. Internet Request for Comments, RFC-2205, September 1997. Cohen, D. and J. B. Postel and R. Rom: IP Adressing and Routing in Local Wireless Network, July 1991. Davies, Nigel and Stephen Pink and Gordon S. Blair: Services to Support Distributed Applications in a Mobile Environment, Lancaster University, Swedish Institute of Computer Science, First International Workshop on Services in Distributed and Networked Environments, Prague, Rpublique Tchque, June 1994. Freeburg, T. A. 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