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previous, encrypted block, and then to XOR the result with the key. This algorithm is quite secure and should not be compared to a simple XOR algorithm, which is highly vulnerable. In a simple XOR algorithm, the key is fairly easily retrievable as soon as you determine its length. All you have to do is find bytes that you know are encrypted within your encrypted block and XOR them with the encrypted data. The result is the key (assuming that you have at least as many bytes as the length of the key). Of course, as I ve demonstrated, a CBC is vulnerable to brute-force attacks, but for this it would be enough to just increase the key length to 64-bits or above. The real problem in copy protection technologies is that eventually the key must be available to the program, and without special hardware it is impossible to hide the key from cracker s eyes.

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Defender reencrypts each function before that function returns to the caller. This creates an (admittedly minor) inconvenience to crackers because they never get to the point where they have the entire program decrypted in memory (which is a perfect time to dump the entire decrypted program to a file and then conveniently reverse it from there).

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One of the key protection features in Defender is its obfuscated interface with the operating system, which is actually quite unusual. The idea is to make it very difficult to identify calls from the program into the operating system, and almost impossible to set breakpoints on operating system APIs. This greatly complicates cracking because most crackers rely on operating system calls for finding important code areas in the target program (think of the Message BoxA call you caught in our KeygenMe3 session). The interface attempts to attach to the operating system without making a single direct API call. This is done by manually finding the first system component (NTDLL.DLL) using the TEB, and then manually searching through its export table for APIs. Except for a single call that takes place during initialization, APIs are never called through the user-mode component. All user-mode OS components are copied to a random memory address when the program starts, and the OS is accessed through this copied code instead of using the original module. Any breakpoints placed on any user-mode API would never be hit. Needless to say, this has a significant memory consumption impact on the program and a certain performance impact (because the program must copy significant amounts of code every time it is started).

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To make it very difficult to determine which API the program is trying to call APIs are searched using a checksum value computed from their names, instead of storing their actual names. Retrieving the API name from its checksum is not possible. There are several weaknesses in this technique. First of all, the implementation in Defender maintained the APIs order from the export table, which simplified the process of determining which API was being called. Randomly reorganizing the table during initialization would prevent crackers from using this approach. Also, for some APIs, it is possible to just directly step into the kernel in a kernel debugger and find out which API is being called. There doesn t seem to be a simple way to work around this problem, but keep in mind that this is primarily true for native NTDLL APIs, and is less true for Win32 APIs. One more thing remember how you saw that Defender was statically linked to KERNEL32.DLL and had an import entry for IsDebuggerPresent The call to that API was obviously irrelevant it was actually in unreachable code. The reason I added that call was that older versions of Windows (Windows NT 4.0 and Windows 2000) just wouldn t let Defender load without it. It looks like Windows expects all programs to make at least one system call.

Figure 14.6 Projection of reliability index versus factor of safety (without model error). (Christian, J. T., Ladd, C. C. and Baecher, G. B., 1994, Reliability Applied to Slope Stability Analysis, Journal of Geotechnical Engineering, ASCE, Vol. 120, No. 12, pp. 2180 2207, reproduced by permission of the American Society of Civil Engineers.)

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