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Most of this book describes how to reverse engineer programs in order to get an insight into their internal workings. This chapter discusses a slightly different aspect of this craft: the general process of deciphering program data. This data can be an undocumented file format, a network protocol, and so on. The process of deciphering such data to the point where it is possible to actually use it for the creation of programs that can accept and produce compatible data is another branch of reverse engineering that is often referred to as data reverse engineering. This chapter demonstrates data reverse-engineering techniques and shows what can be done with them. The most common reason for performing any kind of data reverse engineering is to achieve interoperability with a third party s software product. There are countless commercial products out there that use proprietary, undocumented data formats. These can be undocumented file formats or networking protocols that cannot be accessed by any program other than those written by the original owner of the format no one else knows the details of the proprietary format. This is a major inconvenience to end users because they cannot easily share their files with people that use a competing program only the products developed by the owner of the file format can access the proprietary file format. This is where data reverse engineering comes into play. Using data reverse engineering techniques it is possible to obtain that missing information regarding a proprietary data format, and write code that reads or even generates data in the proprietary format. There are numerous real-world examples

What works for one person may not work for another, but the key thing is to record as much information as possible, as consistently as possible, so it can be easily accessed in the future. Any measurements need to be speci ed as clearly as you can (weight on the bathroom scales, having been to the loo, at 8:00; length from the top of the mast to the centre of the back of the boat, etc.). Hardback books are usually better than loose sheets of paper; you are less likely to lose them and they last far longer. Remember RAP record:

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Figure 22.15 Uncorrected SPT N values at KSS site. (T. W. Lambe & Associates 1982, 1989, reproduced with permission.)

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where this type of reverse engineering has been performed in order to achieve interoperability between the data formats of popular commercial products. Consider Microsoft Word for example. This program has an undocumented file format (the famous .doc format), so in order for third-party programs to be able to open or create .doc files (and there are actually quite a few programs that do that) someone had to reverse engineer the Microsoft Word file format. This is exactly the type of reverse engineering demonstrated in this chapter.

Cryptex is a little program I ve written as a data reverse-engineering exercise It is basically a command-line data encryption tool that can encrypt files using a password In this chapter, you will be analyzing the Cryptex file format up to the point where you could theoretically write a program that reads or writes into such files I will also take this opportunity to demonstrate how you can use reversing techniques to evaluate the level of security offered by these types of programs Cryptex manages archive files (with the extension crx) that can contain multiple encrypted files, just like other file archiving formats such as Zip, and so on Cryptex supports adding an unlimited number of files into a single archive The size of each individual file and of the archive itself is unlimited Cryptex encrypts files using the 3DES encryption algorithm.

in which H M v R Sc = = = = = depth magnitude effective vertical stress in psi hypocentral dist. in miles empirical cyclic strength

3DES is an enhanced version of the original (and extremely popular) DES algorithm, designed by IBM in 1976 The basic DES (Data Encryption Standard) algorithm uses a 56-bit key to encrypt data Because modern computers can relatively easily find a 56-bit key using brute-force methods, the keys must be made longer The 3DES algorithm simply uses three different 56-bit keys and encrypts the plaintext three times using the original DES algorithm, each time with a different key 3DES (or triple-DES) effectively uses a 168-bit key (56 times 3) In Cryptex, this key is produced from a textual password supplied while running the program The actual level of security obtained by using the program depends heavily on the passwords used.

Using regression analysis of worldwide data, Yegian and Whitman developed an empirical relationship between cyclic strength and corrected blow count, Nc , Sc =

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On one hand, if you encrypt files using a trivial password such as 12345 or your own name, you will gain very little security because it would be trivial to implement a dictionary-based brute-force attack and easily recover the decryption key If, on the other hand, you use long and unpredictable passwords such as j8&1`#:#mAkQ)d* and keep those passwords safe, Cryptex would actually provide a fairly high level of security..

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