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string myKey = "TheUniqueKey"; Dictionary<string, object> myDictionary = new Dictionary<string, object>(); myDictionary.Add(myKey, new object()); // Imagine you could do this... myKey[2] = 'o';

Remember, a string is a reference type, so the myKey variable references a string object which is initialized to "TheUniqueKey" When we add our object to the dictionary, we pass a reference to that same string object, which the dictionary will use as a key If you cast your mind back to 9, you ll remember that the dictionary relies on the hash code for the key object when storing dictionary entries, which can then be disambiguated (if necessary) by the actual value of the key itself Now, imagine that we could modify the original string object, using the reference we hold in that myKey variable One characteristic of a (useful!) hash algorithm is that its output changes for any change in the original data So all of a sudden our key s hash code has changed The hash for "TheUniqueKey" is different from the one for "ThoUnique Key".

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In the preceding example, the CA signed a certificate for Alice. However, as you can imagine, if the CA had to authenticate every principal in the system prior to signing a certificate, the CA could get quite overburdened. In some systems, the CA can authorize another entity called a registration authority (RA) to authenticate users. The CA signs a certificate binding the RA s identity to the RA s public key, and then the RA can authenticate principals on behalf of the CA. In such a system, the signature function is modified to also package the RA s certificate into the signature, and the preceding verification function is modified to check the signature on the RA s certificate. You could imagine generalizing such a system to allow for an arbitrary number of intermediaries, where a chain of certificates is verified, each certificate being a link in a chain that leads to the root CA certificate. There have also been vulnerabilities in which intermediate certificates for RAs have not been verified properly. In one case, because Internet Explorer did not properly verify intermediate RA certificates, it was possible for any web site with a signed certificate to sign another one for any other arbitrary domain. Internet Explorer would not verify the intermediate certificate, and as a result would trust the arbitrary domain (see http://seclists.org/ bugtraq/2002/Aug/0111.html). Hence, it is important to be extremely careful when verifying signatures in even moderately complex systems.

Sadly, the dictionary has no way of knowing that the hash for that key has changed; so, when we come to look up the value using our original reference to our key, it will no longer find a match This can (and does!) cause all sorts of subtle bugs in applications built on runtimes that allow mutable strings But since NET strings are immutable, this problem cannot occur if you use strings as keys Another, related, benefit is that you avoid the buffer-overrun issues so prevalent on other runtimes Because you can t modify an existing string, you can t accidentally run over the end of your allocation and start stamping on other memory, causing crashes at best and security holes at worst Of course, immutable strings are not the only way the .

We will be creating the JavaScript file first, so select JScript File from the Add New Item dialog box (see Figure 9-9).

NET designers could have addressed this problem, but they do offer a very simple solution that helps the developer fall naturally into doing the right thing, without having to think about it We think that this is a very neat piece of design So, we can obtain (ie, read) a character at a particular index in the string, using the square-bracket indexer syntax What about slicing and dicing the string in other ways.

For many years, programmers have written methods that detect errors, and which report those errors by returning an error code. Typically, this is a Boolean value of some kind, with True representing success and False failure. Or you might use either an int or an enum if you need to distinguish lots of different types of errors.

Before we add an error return value, we should remove the code we just added that silently enforces the constraints. We can delete EnsurePlat formSize and any references to it. (Or if you re following along in Visual Studio and don t want to delete the code, just comment out all the relevant lines.)

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