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Hashing algorithms are one-way cryptographic functions that take plaintext of variable length and generate a fixed-size numeric value. They are one-way because it s nearly impossible to derive the original plaintext from the hash code. Hashing algorithms are deterministic; applying the same hashing algorithm to a specific piece of plaintext always generates the same hash code. This makes hash codes useful for determining if two blocks of plaintext (passwords in this case) are the same. The design of hashing algorithms ensures that the chance of two different pieces of plaintext generating the same hash code is extremely small (although not impossible). In addition, there is no correlation between the similarity of two pieces of plaintext and their hash codes; minor differences in the plaintext cause significant differences in the resulting hash codes. When using passwords to authenticate a user, you are not concerned with the content of the password that the user enters. You need to know only that the entered password matches the password that you have recorded for that user in your accounts database. The nature of hashing algorithms makes them ideal for storing passwords securely. When the user provides a new password, you must create the hash code of the password and store it, and then discard the plaintext password. Each time the user tries to authenticate with your application, calculate the hash code of the password that user provides and compare it with the hash code you have stored.

This attribute indicates whether the timeline can skip calling the action function of the keyframe if the master timer gets behind and more than one timeline cycle is skipped between time pulses. If it is set to True, only one call to the action function will occur for each time pulse regardless of how many cycles have occurred since the last execution of the action. Listing 13-3 and Figure 13-3 illustrate how to use the action attribute of the keyframe. Listing 13-3. KeyFrame action import import import import import javafx.stage.*; javafx.scene.shape.*; javafx.scene.paint.*; javafx.animation.*; javafx.scene.*;

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People regularly ask how to obtain a password from a hash code. The simple answer is that you cannot. The whole purpose of a hash code is to act as a token that you can freely store without creating security holes. If a user forgets a password, you cannot derive it from the stored hash code. Rather, you must either reset the account to some default value or generate a new password for the user.

The easiest way of adding JavaScript code to web pages is to add it just like HTML markup that is, drop an HTML module on a page and just type your script in it. The problem is it may not always work. Office Live isn t very fond of JavaScript, and for good reason. When used indiscriminately, JavaScript can wreak havoc and bring web servers to their knees. In fact, Office Live s technology has several safeguards against malicious or ignorant people trying to add potentially harmful JavaScript to their web pages. These safeguards might prevent the script you add from executing as expected. When that happens, your web page might just freeze in a visitor s browser or throw an error, causing your web page to look like the one shown in Figure 11-4.

var scaleX: Number = 1.0; var scaleY: Number = 1.0; var rotate: Number = 0; var timeline : Timeline; var scene:Scene; var sceneWidth = bind scene.width; var sceneHeight = bind scene.height; var colors = [Color.RED, Color.BLUE, Color.GREEN, Color.LIME, Color.BROWN, Color.GOLD, Color.PINK]; var colorIndex = 0 on replace { if (colorIndex >= sizeof colors - 1) { colorIndex = 0; } } var fillColor = bind colors[colorIndex]; var rect: Rectangle = Rectangle { x: bind sceneWidth/2 - 50 y: bind sceneHeight/2 - 50 width: 100 height: 100 fill: bind fillColor stroke: Color.YELLOW strokeWidth: 2.0 scaleX: bind scaleX scaleY: bind scaleY rotate: bind rotate

Generating hash codes is simple in the .NET Framework. The abstract class HashAlgorithm provides a base from which all concrete hashing algorithm implementations derive. The .NET Framework class library includes the seven hashing algorithm implementations listed in Table 11-4; each implementation class is a member of the System.Security.Cryptography namespace. The classes with names ending in CryptoServiceProvider wrap functionality provided by the native Win32 CryptoAPI, whereas those with names ending in Managed are fully implemented in managed code. Table 11-4. Hashing Algorithm Implementations

MD5 RIPEMD160 or RIPEMD-160 (new in .NET 2.0) SHA or SHA1 SHA1Managed SHA256 or SHA-256 SHA384 or SHA-384 SHA512 or SHA-512

Don t worry if you can t understand the message. In plain English, it means Don t add weird stuff to your pages, you doofus!

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