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So where are we going to return the error from Our first instinct might be to put it in the RunFor method, where we suggested earlier; but look at the code there s nothing substantive there. The problem actually occurs in Rotate. What happens if we change the Rotate method later so that it depends on different properties Do we also update RunFor to check the new constraints Will we remember It is Rotate that actually uses the properties, so as a rule of thumb we should do the checking there. It will also make the debugging easier later we can put breakpoints near the origin of the error and see what is going wrong. Let s change the Rotate method and see what happens (see Example 6-6).

Digital signatures can also be used to sign electronic mail, as in the Pretty Good Privacy (PGP) system developed by Phil Zimmerman. However, requiring every user to purchase a certificate from a CA (or even RA) could be quite costly. Instead, PGP allows for a web of trust model in which users sign their own certificates, and users sign each other s certificates to establish trust. If you receive an e-mail that is signed by someone you do not know, if the two of you can find a certificate chain to someone that you may know in common, then you may be able to have some level of trust when verifying each other s signatures. However, in general, trust is not a transitive property, and the longer the chain, the less you may be able to trust the validity of the signature.

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private bool Rotate(double duration) { if (PlatformWidth <= 0.0) { return false; }

}

// This is the total circumference of turning circle double circum = Math.PI * PlatformWidth; // This is the total distance traveled double d = duration * MotorSpeed; if (LeftMotorState == MotorState.Reversed) { // And we're going backwards if the motors are reversed d *= -1.0; } // So we've driven it this proportion of the way round double proportionOfWholeCircle = d / circum; // Once round is 360 degrees (or 2pi radians), so we have traveled CurrentOrientation = CurrentOrientation + (Math.PI * 2.0 * proportionOfWholeCircle); return true;

If we compile and run with our all-new error checking added, we see the following output:

Arthur Arthur Arthur Arthur Arthur Arthur is is is is is is at at at at at at (0,0) and is pointing at angle 0.00 radians. (0,10) and is pointing at angle 0.00 radians. (0,10) and is pointing at angle 0.00 radians. (0,-15) and is pointing at angle 0.00 radians. (0,-15) and is pointing at angle 0.00 radians. (0,-18.5355339059327) and is pointing at angle 0.00 radians.

Security researchers have devised approaches that can find pairs of input strings that result in the same hash (Wang, Yin, and Yu 2005). As of the writing of this book, to find a collision against SHA-1, approximately 263 hash computations need to be performed. While the use of SHA-1 may continue to be secure for some applications (such as HMAC-SHA-1), it may be acceptable only in the very near future. The attacks against MD5 are more serious, and you should probably transition away from it immediately, if you have not done so already. Hash functions are widely used in the MAC and digital signature schemes that we described in this chapter. Since the attacks are collision attacks, not pre-image attacks, all is not lost. An attacker would not be able to use these attacks to fake an arbitrary digital signature on an existing document. However, an attacker that has access to lots of computational power may be able to use these attacks to construct two new documents that result in the same hash, obtain a digital signature on one of them, and claim that the other was signed. Nevertheless, the security landscape continues to change as new attacks are discovered from time to time, and we provide a section of our web site, www.learnsecurity.com/ntk, dedicated to keeping you up-to-date on the security of hash functions. As a result of some of these attacks, NIST has recommended that SHA-1 be phased out by 2010 in favor of newer variants of SHA, such as SHA-256 and SHA-512. SHA-256, like SHA-1, takes 512 bits of input, but produces 256 bits of output. SHA-512 takes 1024 bits of input and produces 512.

Hmmm; that s not very good. Rotate has indeed failed, but we ve carried on driving the turtle up and down that line because we didn t do anything with the return value.

Type TechnoratiBlock.js into the name field and then click the Add button. A file named TechnoratiBlock.js will appear in the MyBlocks folder. Now, we need to create the XML definition file. Right-click and select Add New Item again. When the Add New Item dialog box appears, select XML File as the file we will be creating, type TechnoratiDefinition.xml in the Name field, and click the Add button (see Figure 9-10). Your MyBlocks folder should have both the TechnoratiBlock.js and TechnoratiBlockDescription.xml files in it now (see Figure 9-11).

Let s look at where we call Rotate and see what we can do with that error (see Example 6-7).

// Run the turtle for the specified duration public void RunFor(double duration) { // ... // // // if The motors are running in opposite directions, so we don't move, we just rotate about the center of the rig ((LeftMotorState == MotorState.Running && RightMotorState == MotorState.Reversed) || (LeftMotorState == MotorState.Reversed && RightMotorState == MotorState.Running))

{

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