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One simple option is to embed the key in the source code of the program that you are writing The advantage of doing so is that you will be able to use the key at runtime to decrypt the file that the program uses But there are many more disadvantages of storing a secret such as a key or password in your source code If you store a password or key in your source code, and the attacker is able to get ahold of your binary, it can be relatively simple to retrieve the password For instance, the vault program in Section 612 had the password opensesame hardcoded in it An attacker can simply run the strings utility program to retrieve the password from the binary.

When we access the property through the relevant interface, it can resolve correctly which member we meant; there s no requirement for a separate implementation for each interface. But what if that was actually wrong What if our Name property on INamedPerson had entirely different semantics from the one on ISettableNamedPerson Let s suppose that one is intended to allow only letters and numbers with no spaces and the other is just our freeform any old text implementation with which we are familiar. Whenever our client expects an INamedPerson we need to provide the second implementation, and whenever the client expects an ISettableNamedPerson, the first. We can do that by explicitly implementing the interfaces.

To explicitly implement a particular member of an interface, you drop the accessibility modifier and add the interface name as a prefix, as shown in Example 4-24.

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class AFootInBothCamps : INamedPerson, ISettableNamedPerson { private string settableName; string INamedPerson.Name { get { Console.WriteLine("Accessed through the INamedPerson interface"); return settableName; } } string ISettableNamedPerson.Name { get { return settableName; } set { Console.WriteLine( "Accessed through the " + "ISettableNamedPerson interface"); if( settableName != null && settableName.Contains(" ") ) { // You can't set it if it contains the space // character return; } settableName = value;

Looking further into Listing 8-1, you can find familiar utility objects, detailed in 7. The environment object is used in the getLatestPosts() function to retrieve the XML generated by the Twitter service and referenced by the URL http://twitter.com/statuses/ public_timeline.xml:

}

}

The strings utility outputs sequences of printable characters that appear in object code, as follows: $ strings vault C@@0@ $ @ Enter password: opensesame __main _impure_ptr calloc cygwin_internal dll_crt0__FP11per_process free gets malloc printf realloc strcmp GetModuleHandleA cygwin1dll KERNEL32dll The strings utility program is available on most UNIX/Linux-based systems, and can also be used by installing Cygwin (wwwcygwincom) on Windows The preceding output was produced using Cygwin on Windows Note that the password opensesame appears in the fourth line of output An attacker who gets ahold of the binary would have no need to use the more complicated buffer overflow attack discussed in 6 What if we were to use a more complicated password We could choose a password that is made up of random characters Chances are that it would still stand out fairly well in the strings output.

}

class Program { static void Main(string[] args) { AFootInBothCamps both = new AFootInBothCamps(); ISettableNamedPerson settablePerson = both; INamedPerson namedPerson = both; settablePerson.Name = "hello"; Console.WriteLine(settablePerson.Name); Console.WriteLine(namedPerson.Name); } Console.ReadKey();

}

Notice how we re creating our object, and then providing two additional references to it: one through a variable of type ISettableNamedPerson and one through INamedPerson. We then call on the Name property through each of those interfaces, and get the following output:

What if the password were truly random, such that the probability that a given bit of the password is either 0 or 1 is exactly 1/2 (as might be the case for a cryptographic key) In that case, the password would contain more entropy than the surrounding object code! Object code is typically made up of regular patterns, and anything that does not fit that pattern could be considered to be a candidate password by the attacker Finally, if you were to choose something less random as a password (say, something that looks like object code itself), the attacker would simply have to brute-force a relatively small dictionary of bytecodes As a result, storing any sort of a password or key in your source code is a bad idea, as it will get compiled into the binary, and can be fairly easily reverse-engineered out of the binary..

Accessed through the ISettableNamedPerson interface hello Accessed through the INamedPerson interface hello

Console.WriteLine(both.Name);

Add the following line to the main function and compile, and we get a compiler error!

'AFootInBothCamps' does not contain a definition for 'Name' and no extension method 'Name' accepting a first argument of type 'AFootInBothCamps' could be found (are you missing a using directive or an assembly reference )

var root = environment .getXml("http://twitter.com/statuses/public_timeline.xml");

We ve seen that error before; it means we re trying to talk to a member that doesn t exist. What s happened is that the members that are explicitly implemented exist only if we are accessing them through the relevant interfaces. However, as long as we explicitly implement one of the two (or two of the three, or however many we re stuck with), we can choose one interface as our default and implement it using the regular syntax, as shown in Example 4-26.

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