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something to client, you have just used the same key twice. Therefore, clients and servers should always use different RC4 keys. RC4 has also suffered from attacks in which the initial bytes of the pseudo-random key stream are weak, as they are distinguishable from random binary strings (Fluhrer, Mantin, and Shamir 2001). The vulnerability due to weak keys allowed security researchers to demonstrate how some protocols such as the WEP (Wired Equivalent Privacy) protocol in the 802.11 wireless standard are effectively broken (Stubblefield, Ioannidis, and Rubin 2002). If you do choose to use RC4, you should discard at least the first 256 bytes of the key stream; some security researchers even suggest discarding at least the first 512 bytes (Paul and Preneel 2004). In addition, RC4 can suffer from attacks by an active eavesdropper. The problem can be solved by including a MAC as part of the message. While RC4 provides fast performance, you should remember the following if you decide to use it: RC4 keys should never be used more than once, a suitable number of initial bytes of the key stream should be discarded, and a MAC should be used to protect the integrity of the ciphertext transmitted.

DateTime time = new DateTime(2001, 12, 24, 13, 14, 15, 16); Console.WriteLine(time.ToString("dddd")); Console.WriteLine(time.ToString("ddd")); Console.WriteLine(time.ToString("dd"));

This will produce:

(As you saw in Example 10-33, a single d means something else: it shows the whole date, in short form.) Other useful formatting characters include:

As with the numeric formats, you can also include string literals, escaping special characters in the usual way.

Now that we know how to control the formatting of various types when we convert them to a string, let s take a step aside for a moment to look at converting back. If we ve got a string, how do we convert that to a numeric type, for instance Probably the easiest way is to use the static methods on the Convert class, as Example 10-39 shows.

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The symmetric ciphers that we have discussed so far all have one thing in common: they all seek to transform the plaintext into a random string of bits. When Alice sends a random string of bits to Bob, Eve may be able to infer that Alice is sending sensitive information to Bob. However, Alice may want to conceal the fact that she is sending sensitive information to Bob.

int converted = Convert.ToInt32("35");

This class also supports numeric conversions from a variety of different bases (specifically 2, 8, 10, and 16), shown in Example 10-40.

int converted = Convert.ToInt32("35", 16); int converted = Convert.ToInt32("0xFF", 16);

Although we get to specify the base as a number, only binary, octal, decimal, and hexadecimal are actually supported. If you request any other base (e.g., 7) the method will throw an ArgumentException. What happens if we pass a string that doesn t represent an instance of the type to which we want to convert, as Example 10-41 does

You can download Visual Web Developer by going to http://msdn2.microsoft.com/ express/aa975050.aspx. Select a language for Visual Web Developer, and a download dialog box will appear (see Figure 8-6). Choose a download location for the installation executable called vwdsetup.exe. Navigate to the location where you downloaded vwdsetup.exe, and double-click it to begin the installation. Click through the installation (choose the default options), which will download additional files (see Figure 8-7). You also have the option to download the MSDN library help files. I recommend you do this so you can have further reference material about .NET and Visual Web Developer.

double converted = Convert.ToDouble("Well, what do you think ");

Steganography is the study of techniques for sending sensitive information that attempt to hide the fact that sensitive information is being sent at all Steganographic techniques typically use a covert channel to send sensitive information from one party to another For example, consider the following message that Alice could send to Bob: All the tools are carefully kept This message may seem harmless enough, but within the message there is a covert channel that is used to send a secret message The covert channel is made up of the first letter of each word in the message, and the first letter of each word spells Attack There are many other examples of steganography for example, invisible ink pens that children use to send messages to each other Authorities have speculated that videos of Osama Bin Laden raising a glass or conducting other actions may have meant something to his followers.

As this string cannot be converted to a double, we see a FormatException. Throwing (and catching) exceptions is a relatively expensive operation, and sometimes we want to try a particular conversion, then, if it fails, try another. We d rather not pay for the exception if we don t have to. Fortunately, the individual numeric types (and DateTime) give us the means to do this. Instead of using Convert, we can use the various TryParse methods they provide. Rather than returning the parsed value, it returns a bool which indicates whether the parse was successful. The parsed value is retrieved via an out parameter. Example 10-42 shows that in use.

int parsed; if (!int.TryParse("Well, how about that", out parsed)) { Console.WriteLine("That didn't parse"); }

For each of the TryParse methods, there is an equivalent Parse, which throws a FormatException on failure and returns the parsed value on success. For many applications, you can use these as an alternative to the Convert methods. Some parse methods can also offer you additional control over the process. Date Time.ParseExact, for example, allows you to provide an exact format specification for the date/time string, as Example 10-43 shows.

DateTime dt = DateTime.ParseExact("12^04^2008","dd^MM^yyyy",CultureInfo.CurrentCulture);

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