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users are outside of the developing organization and the software is not open source, you should probably consider introducing some form of antireversing measures into the program. Granted, not every program is worth the effort of reversing it. Some programs contain relatively simple code that would be much easier to rewrite than to reverse from the program s binary. Some applications have a special need for antireversing measures. An excellent example is copy protection technologies and digital rights management technologies. Preventing or obstructing reversers from looking inside copy protection technologies is often a crucial step of creating an effective means of protection. Additionally, some software development platforms really necessitate some form of antireversing measures, because otherwise the program can be very easily converted back to a near-source-code representation. This is true for most bytecode-based platforms such as Java and .NET, and is the reason why so many code obfuscators have been created for such platforms (though it is also possible to obfuscate programs that were compiled to a native processor machine language). An obfuscator is an automated tool that reduces the readability of a program by modifying it or eliminating certain information from it. Code obfuscation is discussed in detail later in this chapter.

If one or more tanks fail, then next event checked is breaching (failure or overtopping) of the rewall. In Figure 22.18 the subsequent branches of the tree are only shown for two tanks failing, but the same subsequent branch emanates from each tank failure event. If the volume of spilled oil within the patio exceeds the storage capacity of the re walls (which by re code needs only equal the volume of one full tank), then the re wall is overtopped and some volume of off-site spill occurs. If one or more tanks fail and the re wall also fails, then off-site spill occurs. As for multiple tank failures, re wall failure is correlated with the failures of tanks, revetment, and possibly other facilities at the site. A complete event tree for the entire KSS site becomes the bushy mess mentioned at the start of this section. It leads to a few thousand end nodes, because the combination of facility failures and non-failures grows exponentially. Nonetheless, a rough approximation of the system failure probability for the entire site can be calculated starting with the probability of a spill from Patio 1, and making the highly simplifying assumption that the entire site consists merely of some number, k, of equivalent, independent such patios. Then, the probability of system failure becomes the probability of an off-site spill from at least one of these equivalent, independent patios Pr{system failure} = 1 (1 Pr{patio failure})k (22.9)

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There are several antireversing approaches, each with its own set of advantages and disadvantages. Applications that are intent on fighting off attackers will typically use a combination of more than one of the approaches discussed. Eliminating Symbolic Information The first and most obvious step in hindering reversers is to eliminate any obvious textual information from the program. In a regular non-bytecode-based compiled program, this simply means to strip all symbolic information from the program executable. In bytecode-based programs, the executables often contain large amounts of internal symbolic information such as class names, class member names, and the names of instantiated global objects. This is true for languages such as Java and for platforms such as .NET. This information can be extremely helpful to reversers, which is why it absolutely must be eliminated from programs where reversing is a concern. The most fundamental feature of pretty much every bytecode obfuscator is to rename all symbols into meaningless sequences of characters. Obfuscating the Program Obfuscation is a generic name for a number of techniques that are aimed at reducing the program s vulnerability to any kind of static analysis such as the manual reversing process described in

this book. This is accomplished by modifying the program s layout, logic, data, and organization in a way that keeps it functionally identical yet far less readable. There are many different approaches to obfuscation, and this chapter discusses and demonstrates the most interesting and effective ones. Embedding Antidebugger Code Another common antireversing approach is aimed specifically at hindering live analysis, in which a reverser steps through the program to determine details regarding how it s internally implemented. The idea is to have the program intentionally perform operations that would somehow damage or disable a debugger, if one is attached. Some of these approaches involve simply detecting that a debugger is present and terminating the program if it is, while others involve more sophisticated means of interfering with debuggers in case one is present. There are numerous antidebugger approaches, and many of them are platform-specific or even debuggerspecific. In this chapter, I will be discussing the most interesting and effective ones, and will try to focus on the more generic techniques.

Among the conclusions drawn from an analysis of the Patio 1 event tree were (i) the logical relationship among failure elements, (ii) the importance of both mechanical and probabilistic correlation among facility (tank, walls, revetment, piping, etc.) failures, (iii) the in uence of speci c combinations of failure conditions on the volume of oil spilled off site, and (iv) a rough estimate of the overall probability of an off-site spill.

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