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Although the application layer is generally where users install items, most of those applications should not have system access to the device, if the framework architecture was designed correctly On the other hand, device drivers for mobile devices, such as Bluetooth and video drivers, will need full access to the system in order to perform their functions properly Although users will not be downloading device drivers on a weekly basics, any device driver that has not been secured properly could be an attack vector, and Achilles heel, for the underlying OS For example, many mobile operating systems have built in a variety of strong security protection schemes again system-level access to the OS; however, if third-party drivers provide a method to get around these protection schemes via their potentially insecure code, the device will be exposed to attackers Furthermore, although it may be a poorly written Bluetooth driver that allows an attacker to get system access on a phone, the manufacturer of that phone (Motorola, Apple, HTC, LG) or the operating system vendor (the iPhone, Google, Microsoft) will be assumed guilty by the user, not the vendor of the device driver

Part VI Connecting Networks 175 Proper network design is a topic worthy of a book of its own We can t hope to do the topic justice in this limited space, but we will point out a few key things that you Part VI Connecting need to keep in mind (see Figure VI-1) Networks A good network design starts from the following questions: Which network services are necessary to support organizational business processes For example, a shipping company needs to be able to track items from pickup to delivery This means that the processing office, the delivery office and the trucks/boats/planes all need to be able to send tracking data into a central tracking system That requires a network The design of the network is going to be heavily influenced by the specifics and requirements of the business process What sort of security is necessary to satisfy business needs Our shipping company probably doesn t want thieves knowing about the contents and whereabouts of every package Therefore, tracking information needs to be securely communicated and handled Is there a conflict between necessary services and security needs In other words, does the business need to use the network in a way that is fundamentally insecure Some elements of processing and handling the shipping company s tracking data might be unavoidably insecure Is there enough money in the budget to provide the needed services at the necessary security level The example shipping company can t afford a multi-million dollar security system Some of the less critical security techniques might need to be dropped Is it possible to use traditional risk management techniques to cover up areas where the security needs can t be satisfied Insurance and other risk mitigation techniques can minimize the exposure in the event of a problem The network doesn t have to solve every problem If a network is already in place, then other important questions also need to be considered: What is the minimum amount of change necessary to achieve business and security goals Is the network providing extra, unused services It is usually the case that a network offers many more services than are actually needed by an organization If excess services are available, trimming down the fat is the next step Services create access points to networks, the fewer services, the fewer holes that exist for an outsider to enter and exploit How are the actual network devices connected The best way to get an overview of the relationship between network devices is by diagramming a network on paper with flow chart software At a glance this will summarize what hardware connects to what, and how information flows along pathways in and out of a network A network map of this sort is often called a topology, or sometimes incorrectly called topography.

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1 Create a new Foundation command-line tool named AutoRelease 2 Create a new NSObject named Bar and implement it like Listings 5-18 and 5-19 3 Create a new NSObject named Foo and implement it like Listings 5-20 and 5-21

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Multifactor authentication (MFA) on mobile devices is strongly needed Unlike the PC, a mobile device can fall into the hands of any person, either on purpose (loaned out to make a phone call or look up something on the Internet) or accidentally (a lost or stolen phone) In order to address this issue, many mobile web applications have built in soft multiple factor authentication that is invisible to the user Most of the

Managing Security: The design of a network directly affects the ability to effectively manage and monitor network systems

4 Modify AutoReleasem s main method (Listing 5-22) 5 Click Build And Debug to compile and run the application

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Listing 5-18

Part VI Connecting Networks 187 Outsourcing Options: Many companies lack the resources in-house to properly design networks and configure network devices 15 Detecting Intrusions: Many of the tools used to analyze networks for intrusions Networks: are very sensitive to network design Networking

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