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This batch file loops through code that attempts to delete the main program executable. The loop is only terminated once the executable is actually gone. That s because the batch file is going to start running while the ZoneLockup.exe executable is still running. The batch file must wait until ZoneLockup.exe is no longer running so that it can be deleted.

If only the dead loads and live loads are considered, this becomes = D QD + L QL FS (QD + QL ) (18.9)

6

SHA Hash (160-bits)

Dividing both the numerator and denominator by QL (O Neill 1995) yields D QD + L QL = QD FS +1 QL

MD5 Hash (128-bits)

21

Now that you have a basic understanding of how Cryptex manages its passwords and encryption keys, you can move on to study the Cryptex directory layout. In a real-world program, this step would be somewhat less relevant for those interested in a security-level analysis for Cryptex, but it would be very important for anyone interested in reading or creating Cryptex-compatible archives. Since we re doing this as an exercise in data reverse engineering, the directory layout is exactly the kind of complex data structure you re looking to get your hands on.

(18.10)

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In order to decipher the directory layout you ll need to find the location in the Cryptex code that reads the encrypted directory layout data, decrypts it, and proceeds to decipher it. This can be accomplished by simply placing a breakpoint on the ReadFile API and tracing forward in the program to see what it does with the data. Let s restart the program in OllyDbg (don t forget to correct the password in the command-line argument), place a breakpoint on ReadFile, and let the program run.

Equation (18.10) can be used to determine the resistance factors that need to be used in the LRFD equations to obtain a factor of safety equal to that of the ASD method. While the load and resistance factor design method represented by Equation (18.6) as calibrated using Equation (18.10) provides a clearer separation of load and resistance uncertainties than does a single factor of safety, the use of the load and resistance factors based on earlier, non-reliability-based procedures does little to improved design. Table 18.1 shows values of the resistance factors using Equation (18.10) for factors of safety varying between 1.5 to 4 and average dead and live load factors of 1.25 and 1.75, respectively. The table gives resistance factors that would be used to obtain factors of safety of 1.5, 2.0, 2.5, 3.0, 3.5 and 4.0 for dead to live load ratios of 1, 2, 3 and 4. Clearly,

The first hit comes from an internal system call made by ADVAPI32DLL Releasing the debugger brings it back to ReadFile again, except that again, it was called internally from system code You will very quickly realize that there are way too many calls to ReadFile for this approach to work; this API is used by the system heavily There are many alternative approaches you could take at this point, depending on the particular application One option would be to try and restrict the ReadFile breakpoint to calls made on the archive file.

You could do this by first placing a breakpoint on the API call that opens or creates the archive (this is probably going to be a call to the CreateFile API), obtain the archive handle from that call, and place a selective breakpoint on ReadFile that only breaks when the specific handle to the Cryptex archive is specified (such breakpoints are supported by most debuggers) This would really reduce the number of calls you d only see the relevant calls where Cryptex reads from the archive, and not hundreds of irrelevant system calls On the other hand, since Cryptex is really a fairly simple program, you could just let it run until it reached the key-generation function from Listing 65 At this point you could just step through the rest of the code until you reach interesting code areas that decipher the directory data structures.

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Table 18.1 Values of resistance factors from Equation (18.10) corresponding to different values of safety factor and dead to live load ratios for D = 1.25 and L = 1.75 (after Withiam et al. 1998) Resistance factor, Safety factor 1.5 2.0 2.5 3.0 3.5 4.0 QD /QL = 1 1.00 0.75 0.60 0.50 0.53 0.38 QD /QL = 2 0.94 0.71 0.57 0.47 0.40 0.35 QL /QD = 3 0.92 0.69 0.55 0.46 0.39 0.34 QL /QD = 4 0.90 0.68 0.54 0.45 0.39 0.34

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