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The MIDP security system is largely based on the X509 Public Key Infrastructure (PKI) The public key infrastructure is integral to the creation of secure connections, and it s also used in the creation of protection domains A digital certificate is a set of data containing cryptographic information that allows you to encrypt messages and verify the identity of the sender A MIDlet is signed by encrypting a hash of the JAR file and placing the corresponding encrypted data in the corresponding JAD file Because the signature is based on a hash of the JAR file, in addition to identifying the MIDlet s origin, the digital signature ensures that the MIDlet JAR and everything in it (particularly the properties in the manifest file) are authentic and have not been modified by a third party.

CHAPTER 8 JOHNNXT IS ALIVE!

The Composite Web Application Block contains functionality for setting up rules that define which users can access specific pages. For instance, you may want only administrators to have access to the admin.aspx page of a web application while allowing general access to the rest of the site. The Composite Web Application Block uses two interfaces to implement authorization functionality: IAuthorizationRulesService provides mapping rules to URLs. IAuthorizationService provides the authorization check for a given rule. The Composite Web Application Block also provides an implementation of IAuthorizationService that allows the Enterprise Library Security Application Block (discussed in 11) to authorize users. Using this approach, any authorization provider, including AzMan, could provide these services.

Note ASP.NET also provides authorization services via an access control list. You can find out more about

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In fact, anyone can create a digital certificate containing any name they want, so a certificate must be recognized in order to be useful for identification purposes In practice, this is accomplished as follows: the handset has a set of root certificates embedded in it that identify the different protection domains Only someone with access to the right keys can sign a MIDlet with a certificate that a handset will recognize When the MIDlet is installed, the signature is verified against the JAR data and against the root certificates on the device, and the MIDlet is assigned to a protection domain accordingly If you re working for a handset manufacturer or mobile operator, the signature will typically be added as the final step after the MIDlet has passed quality control.

this subject on the MSDN website (search for ASP.NET Authorization ).

This long, long chapter about JohnNXT is at an end. You have built and programmed a very complex robot, and now you have a great model to play with. You can use the program I showed here to see him move autonomously or to control him remotely. You can even program him as you wish, by using the programming guide provided. If you think the laser is not politically correct, you can do as Johnny did in Short Circuit 2, by replacing the harmful weapon with something else: a hang glider, a parachute, or an umbrella (weird!).

If you d like your MIDlet to be placed in the identified third-party domain, you can apply for a certificate from a known Certificate Authority (CA) such as VeriSign For testing and development, you can create your own certificate and embed it in the WTK emulator using KToolbar KToolbar even allows you to generate the certificate signing request file to send to a CA if you d like to go through the CA s application procedure to get your certificate signed by the CA s certificate so that your MIDlets will be installed in the identified third-party domain KToolbar makes the signing procedure simple Once you ve opened a project, select Sign from the Project menu, then select New Key Pair in the window that comes up This generates a new pair of keys that are placed in the WTK s appdb/mainsks file.

The last major component of the Composite Web Application Block is the ModuleSiteMapProvider class. This class is responsible for keeping an in-memory representation of the web site navigation. The ModuleSiteMapProvider class supports an implementation of the IAuthorizationService to determine if a particular user has access to a particular module.

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