Simple .NET/ASP.NET PDF document editor web control SDK

So far, we have checked who is connecting to the application (authentication) and which parts of the application those users are allowed to access (authorization). However, we have not yet ensured that their conversation with the application cannot be overheard, so we will now address the problem of securing the channel of communication from eavesdroppers. The larger part of the problem has already been solved for us. Java EE defines a mechanism by which exchanges with a web application can be secured when using the Secure Sockets Layer (SSL) encryption protocol. Channel security is traded off against other considerations such as user convenience and application performance; as always, you will have some subjective decisions to make.

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Figure 3-4. Player and meteor texture As you did for the background, first declare the texture in the Game1 class: private Texture2D meteorTexture; Then load it in the LoadContent method immediately after loading the background texture: meteorTexture = content.Load<Texture2D>(" RockRain");

Note The steps required to configure SSL support vary widely between web application server platforms.

Note The graphics in this chapter and the next were built using SpriteLIB GPL, available from http://

I do not attempt to cover them in this book. You should consult your vendor s website for specifics. Instructions for configuring the Tomcat 5.5 application server that I used while writing this book are available at http://tomcat.apache.org/tomcat-5.5-doc/ssl-howto.html.

www.flyingyogi.com/fun/spritelib.html. SpriteLib GPL is a collection of static and animated graphic objects (also commonly known as sprites).

If you want your entire application to be secured from eavesdroppers, you need do nothing more than ensure that your application server accepts connections only on the secure port. However, the use of encryption comes with some performance disadvantages.

Now you ll create a class that represents the player in the game. Add a new GameComponent to the project, name the file Ship.cs (as in Figure 3-5), and click OK. The new file added to the project contains a class that derives from GameComponent. This game component will be visible in the game; therefore, it must be drawn. Derive from DrawableGameComponent so that you have a Draw method you can use to draw in the game. This game component copies the texture region that contains the picture of the spaceship in the specified position. To accomplish that, it needs the texture where this picture is, the coordinates of the picture in this texture, and the coordinates on the screen where the picture must be rendered.

Encrypting and decrypting communications makes significant demands of the processor, and the use of an encrypted channel prevents you from being able to cache secured pages. In practice, it is more typical to secure only particularly sensitive information from eavesdroppers. On an e-commerce website, this would probably include the username and password, any credit card details, and perhaps the user s other personal account details. On the timesheet application, we will secure the login process, preventing a hypothetical eavesdropper from obtaining the user s credentials and using them to falsely authenticate with the application at a subsequent date. Channel security can be enforced by using yet another processing filter. Typically, you would add this to the filter chain for all URLs being processed by the application. Listing 7-15 shows the addition of the channel filter to the filter chain established in Listing 7-2.