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It is good security practice to only use a key for one purpose. For example, a single key should not be used as both a session key and an integrity key. If an adversary figures out a session key, she will be able to decrypt and eavesdrop, but not necessarily tamper with the messages. On the other hand, if the same key is used both as a session key and an integrity key, the adversary will be able to read and modify bits in the encrypted conversation. Of course, the hope is that the vulnerability that allowed the attacker to figure out the session key cannot also be used to determine the integrity key! Nevertheless, using one key for only one purpose is the right, paranoid thing to do, and can provide additional protection.

// Int variable int myIntVariable = 1; object myObject = myIntVariable; int anotherIntVariable = (int)myObject;

Notice how we use the type name in parentheses to perform the conversion back to an int. In general, this sort of conversion from one type to another is known as a cast, and will work for classes too (although we ll see a more explicit way of doing that later in this chapter). The runtime looks at that box object for us and checks that it contains a value of the correct type. If so, it will copy the value back out of the box and into the new variable.

What if it isn t of the correct type The runtime will throw an Invalid CastException. You can find out more about exceptions in 6.

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That process is known as unboxing, and is also quite expensive (although not as expensive as boxing, as it doesn t need to allocate the object). Although these performance costs are individually fairly small, if you are processing large numbers of value types in a way that requires them to be repeatedly boxed and unboxed the costs can add up quite rapidly; so you should be aware of boxing and unboxing when you are profiling your application. So the only common base of both Firefighter and Administrator is Object at the moment (remember, everything is ultimately derived from Object). That seems a bit low level, but it is all we have to go on for now, so we ll make do. Example 4-17 shows our first pass at a FireStation.

class FireStation { List<object> clockedInStaff = new List<object>(); public void ClockIn(object staffMember) { if (!clockedInStaff.Contains(staffMember)) { clockedInStaff.Add(staffMember); } } public void RollCall() { foreach(object staffMember in clockedInStaff) { // Hmmm... What to do } }

How to generate keys depends on the type of algorithm with which the key is expected to be used. When using many symmetric encryption algorithms, a key can be generated at random. We will discuss exactly what we mean by random shortly. Also, in some symmetric algorithms, some keys are considered to be weak. For example, due to the mathematics of how DES works, keys that are all zeros or all ones will result in a self-inversion in which F(F(m,k),k) = m. That is, encrypting twice will result in decryption. If such a weak key is used, and an adversary could trick Alice into encrypting ciphertext, the adversary would be able to obtain the plaintext without even knowing the key! To be most cautious, such weak keys should be checked for and discarded instead of being used. While keys for symmetric algorithms can, for the most part, be generated at random, weak keys should be avoided.

case "url" : { url = userItems[l].firstChild.nodeValue; break; } } //inner switch } //inner else if switch } //inner for }// case }//switch }//outer else if }//for (k) statusArray[i] = new TwitterStatus(messageID, text, createdAt, userID, screenName, location, description,imageUrl, url); } //for (i) return statusArray; } function TwitterStatus(messageID, text, createdAt, userID, screenName, location, description, imageUrl, url) { this.messageID = messageID; this.text = text; this.createdAt = createdAt; this.userID = userID; this.screenName = screenName; this.location = location; this.description = description; this.imageUrl = imageUrl; this.url = url; this.toString = function() { var sb = new Sys.StringBuilder(); sb.append("<img border='0' src='" + this.imageUrl + "' >" + "<br>"); sb.append("text: " + this.text + "<br>"); sb.append("createdAt: " + this.createdAt + "<br>"); sb.append("screenName: " + this.screenName + "<br>"); sb.append("location: " + this.location + "<br>"); sb.append("description: " + this.description + "<br>"); sb.append("<a href='" + this.url + "'>link</a>" + "<br>");

}

Our ClockIn method is making use of a list of objects to keep track of who is in the station. To do that it is using the generic collection class List<T> we first saw in 2. Using the List.Contains method, the implementation checks that they weren t already in the station, and adds them if necessary. Everything is fine so far. Then we reach the RollCall method. We re using foreach to iterate over the clocked-in staff, but we don t actually have a method to call to get their names! We want a way of indicating that these disparate object types (firefighters, fire chiefs, and administrators) all support giving out their name. We saw one way of doing that already: we could create a common base class, and move the Name functionality in there. Let s see what happens if we try to do that. Practically speaking, we have two completely different implementations of the Name property. We saw that we can model that situation with an abstract base class from which Firefighter and Administrator both derive, both implementing the method in their own way. Here s our NamedPerson base with an abstract property for the Name:

abstract class NamedPerson { public abstract string Name { get; } }

There s no problem when we implement this on our Administrator:

1. The password better be strong, long, and very random!

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