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Unfortunately, true non-repudiation is not provided by SSL, and is not implemented on most web sites, partially due to the absence of a practical protocol for non-repudiation, and partially because there are no organizations to serve as the trusted third parties. In practice, when customers pay for services with credit cards on web sites, Visa and Mastercard take on the role of trusted third parties, but they usually end up trusting their users much more than the merchant web sites from which their users buy products. If a user claims that he or she did not place an order with a merchant, then the credit card company favors the user and issues a chargeback. In the physical world, merchants can fight the chargeback if they can produce a receipt that the user signed. Of course, in the context of a web transaction, there is no good proxy or replacement for a receipt signed by the user! While we unfortunately do not see true non-repudiation on the Web today, it is possible that the Web of the future will provide better non-repudiation capabilities.

as being equivalent to the code in Example 7-27.

CanChange elem = aai[20]; elem.Number = 456;

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And in fact, that s what it would have done if we were using a reference type. However, it has noticed that CanChange is a value type, and has therefore rejected the code. (The error message says nothing about value types, but you can verify that this is the heart of the problem by changing the CanChange type from a struct to a class. That removes the compiler error, and you ll find that the code aai[20].Number = 456 works as expected.) Why has the compiler rejected this seemingly obvious solution Well, remember that the crucial difference between reference types and value types is that values usually involve copies if you retrieve a value from an indexer, the indexer returns a copy. So in Example 7-27 the elem variable holds a copy of the item at index 20. Setting elem.Number to 456 has an effect on only that copy the original item in the array remains unchanged. This makes clear why the compiler rejected our code the only thing it can do with this:

aai[20].Number = 456;

is to call the get accessor, and then set the Number property on the copy returned by the array, leaving the original value unaltered. Since the copy would then immediately be discarded, the compiler has wisely determined that this is almost certainly not what we meant. (If we really want that copy-then-modify behavior, we can always write the code in Example 7-27 ourselves, making the fact that there s a copy explicit. Putting the copy into a named variable also gives us the opportunity to go on and do something with the copy, meaning that setting a property on the copy might no longer be a waste of effort.)

his chapter examines how to architect and design systems that accomplish the security goals covered in 1. We first spend some time discussing prototypical threats to software, and then discuss how to design security into applications from the beginning. We focus on a number of high-level approaches and trade-offs, and discuss how security is sometimes perceived to be at odds with factors such as convenience and usability. We also discuss the concept of security by obscurity and why it is usually not sufficient. We look at security as a game of economics and risk management. Some of the approaches and design principles we cover in this chapter and the next were for the first time described in Jerome Saltzer and Michael Schroeder s paper, The Protection of Information in Computer Systems we bring them to life and illustrate them with many real-world examples. We also illustrate the approaches, trade-offs, and security design principles using a concrete, running code example throughout this chapter and the next. While most security books only talk about these principles in the abstract, we present actual code examples for a simple, small web server, and show specifically how it can be exploited by an attacker if security design principles are not followed. The code is written in the Java programming language, but we explain each line of code such that programmers of any language should be able to understand how the principles apply in their favorite programming language. The code examples can be downloaded from www.learnsecurity.com/ntk.

You might be thinking that the compiler could read and modify a copy like Example 7-27, and then write that value back using the set indexer accessor. However, as Example 7-24 showed, indexer accessors are not required to work in the obvious way, and more generally, accessors can have side effects. So the C# compiler cannot assume that such a getmodify-set sequence is necessarily safe.

This problem doesn t arise with reference types, because in that case, the get accessor returns a reference rather than a value no copying occurs because that reference refers to the same object that the corresponding array entry refers to. But why does this work when we use the array directly Recall that the compiler didn t have a problem with this code:

aai.TheArray[10].Number = 123;

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