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In general, passwords are not really secure on their own It s often easy for a hacker Determining to intercept the usage, transmission, or storage of passwords Therefore, passwords Identity: Passwords are best used in addition to some other type of authentication device, such as a biometric scanner or a portable identifier For example, when entering a personal ID number (PIN) on a touch screen, a scan is made of the fingerprints Access is granted if both the password and fingerprints match These other authentication systems are described in the following chapters A combination system can also be used to spot compromised passwords A red flag should be raised if a secondary authentication fails, yet the password succeeds By logging and investigating such failures, a security administrator can detect and deactivate compromised passwords

The device decides the privilege level based on the application s Authenticode signature Authenticode is a Microsoft technology for attaching cryptographic signatures to various file types The signature uses public key cryptography to ensure that the application has not been modified If the application is tampered with, the signature will be invalidated Associated with the key pair is a X509 certificate This certificate includes information about the developer of the application and is issued by a Certification Authority (CA) The CA is responsible for verifying who the developer is before issuing the certificate After verifying the developer s identity, the CA signs the developer s certificate using the CA root certificate A developer s

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certificate signed by a CA root certificate is chained to that root Multiple CAs are currently issuing certificates, and there are many types of certificates All certificates are cryptographically equivalent and are only differentiated by their marked usages The certificates used by Windows Mobile are marked valid for code signing On Windows Mobile devices, the common file types with signatures are CAB files, EXE executables, and DLLs Before releasing an application, the application s developer generates the signature and signs the application using Authenticode Once an application is signed, the application cannot be modified without invalidating the signature Users and the Windows Mobile OS can make trust decisions based on a valid signature and whether or not the application developer is trusted Not all applications must be signed, and not all signed applications can be trusted Whether or not the application should run is up to the device s security policy and, in some cases, the user Signed applications can still have security vulnerabilities or be malicious The signature process only adds accountability Because the publisher information is included in the Authenticode signature, users can see who actually wrote the application Once users choose to run the application, all bets are off, and the application can perform any operation allowed by its privilege level

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Throughout this chapter, without any explanation, you used the Utility Application template This template creates a simple two-view application The info button on the application s first view, when pressed, takes the user to the second screen The front view is the MainView, and its controller is the UIViewController The second view is the FlipsideView, and its controller is the FlipsideViewController The UIView represents a view, while a UIViewController represents a view s controller Every view has a view controller that handles life-cycle events for the view When creating a view, you can either accept a view s default view controller by not creating your own, or you can override the default by creating your own view controller for a view You create your own view controller using something called inheritance, which you will learn in 6 Figure 3-3 illustrates how the Utility Application implements its views and view controllers Note that you can also create a custom view implementation, as Figure 3-3 shows For now, the important thing to understand from Figure 3-3 is that the MainView and FlipsideView are both UIViews and that the MainViewController and FlipsideViewController are both UIViewControllers You should also understand that the UIView and the UIViewController work together when displaying a view in an iPhone s window The UIView handles displaying a view The UIViewController handles life-cycle methods and other behind-the-scenes tasks when displaying a view One behind-the-scenes job a UIViewController handles is allowing a program to execute custom code when its UIView loads, appears, disappears, and unloads When a

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