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For each of these threats, you should have prevention, detection, containment, and recovery measures listed in the rows of the table to work toward truly employing defense-in-depth You can use various countermeasures to achieve defense-in-depth, and write the ones that you are using in the cells of the table For instance, you could use image authentication to prevent phishing attacks (see Section 969) You could also use techniques to contain the possible effect of phishing attacks For instance, if you re securing a bank, you might avoid enabling online bill payment by default for your customers, and instead require them to call into the bank to enable bill payment for the first time In addition, you can look for anomalous bill payment requests (eg, for more than a certain dollar amount to a newly added payee).

If we compile and run, we ll see the following output:

Arthur is at (0,0) and is pointing at angle 0.00 radians. Must provide a duration greater than 0 Parameter name: duration Waiting in the finally block

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You might want to create your own exceptions for a couple of reasons: My exception is a special snowflake. I want to group my exceptions together for layered exception handling. The first of these is the most problematic. You should think very carefully about whether your exception is really special, or whether you can just reuse an existing exception type. When you introduce new exceptions, you re asking clients to understand and deal with a new type of problem, and you re expecting them to handle it in a special way. There are occasional instances of this, but more often the differences are in the context (i.e., that it was thrown from your code) rather than the exception itself (i.e., something was out of range, invalid, null, or unavailable, or it timed out). Slightly more often, you provide custom exception types when you want to provide a convenient API over some additional information that comes along with the exception. The Exception.Data property we discussed earlier might be a better solution it gives you somewhere to put information without needing to add a new kind of exception. But the convenience of a dedicated property might outweigh the costs of introducing a custom exception. Finally, you might wish to create a custom exception class to allow you to conceptually group some subsystem s exceptions together. DbException is an example of this in the .NET Framework; it represents the various errors that can occur when using a database. There are various specialized errors that derive from this, such as the SqlException thrown by the SQL Server subsystem, but the common base class

function TechnoratiClass() { }

enables you to write a single catch for all database errors, rather than having to handle provider-specific errors. Again, you should think carefully about this before doing it: what client exceptionhandling scenarios are you enabling, and why do you need the custom type However, having been through all of this, creating your own exception type is very simple. Let s create a TurtleException for our exception wrapper (see Example 6-23).

Doing such checks can help contain the effect of a phisher getting ahold of a legitimate username and password After you have filled in the table with all of the techniques that you are currently using, the table format should help you identify cells that are empty or inadequately filled-in as compared to the others This will tell you that you may need to implement additional countermeasures to round out a security strategy that employs defense-in-depth You can also decide the appropriate percentage of effort for your business to spend on prevention, detection, containment, and recovery, and make sure that your investment in various types of countermeasures is commensurate with your intended effort..

Whether we really want a TurtleException is another matter. I m not sure I really would in these circumstances, but your mileage may vary.

[Serializable] class TurtleException : Exception { public TurtleException() {} public TurtleException(string message) : base(message) { } public TurtleException(string message, Exception innerException) : base(message, innerException) {} // For serialization support protected TurtleException(SerializationInfo info, StreamingContext context) : base(info, context) {}

}

The first thing to notice is that we derive from Exception. If you ve plowed through the MSDN documentation you might have noticed the ApplicationException type, which derives from Exception, and was provided as a base class for application-defined exceptions. Why, you might ask, are we not deriving from ApplicationException Well, ApplicationException adds no functionality to Exception, and the .NET designers could not come up with a scenario where it was useful to catch ApplicationException (as opposed to Exception). Sadly, they only realized this after .NET 1.0 had shipped, so it is in the library, but it is now deprecated. You should neither derive from nor catch ApplicationException. Also, we provide a bunch of standard constructors: a default parameterless constructor, one that takes a message, and one that takes a message and an inner exception. Even

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