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Figure 22.16 Probability of tank failure as a function of settlement. (T. W. Lambe & Associates 1982, 1989, reproduced with permission.) Table 22.2 Discrete approximation to seismic hazard at the KSS site Base level velocity (cm/sec) value (range) 2 5 10 20 (1 3) (3 7) (7 15) (>15)

How does one begin to reverse a file format In most cases, the answer is to create simple, tiny files that contain known, easy-to-spot values. In the case of Cryptex, this boils down to creating one or more small archives that contain a single file with easily recognizable contents. This approach is very helpful, but it is not always going to be feasible. For example, with some file formats you might only have access to code that reads from the file, but not to the code that generates files using that format. This would greatly increase the complexity of the reversing process, because it would limit our options. In such cases, you would usually need to spend significant amounts of time studying the code that reads your file format. In most cases, a thorough analysis of such code would provide most of the answers. Luckily, in this particular case Cryptex lets you create as many archives as you please, so you can freely experiment. The best idea at this point would be to take a simple text file containing something like a long sequence of a single character such as ***************************** and to encode it

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into an archive file. Additionally, I would recommend trying out some long and repetitive password, to try and see if, God forbid, the password is somehow stored in the file. It also makes sense to quickly scan the file for the original name of the encrypted file, to see if Cryptex encrypts the actual file table, or just the actual file contents. Let s start out by creating a tiny file called asterisks.txt, and fill it with a long sequence of asterisks (I created a file about 1K long). Then proceed to creating a Cryptex archive that contains the asterisks.txt file. Let s use the string 6666666666 as the password.

Surface acceleration (cm/sec2 ) value (range) 50 100 200 300 (30 75) (75 150) (150 250) (>250)

Cryptex 1.0 - Written by Eldad Eilam Archive Test1.crx does not exist. Creating a new archive. Adding file asterisks.txt to archive Test1 . Encrypting asterisks.txt - 100.00 percent completed.

Interestingly, if you check the file size for Test1.crx, it is far larger than expected, at 8,248 bytes! It looks as if Cryptex archives have quite a bit of overhead you ll soon see why that is. Before actually starting to look inside the file, let s ask Cryptex to show its contents, just to see how Cryptex views it. You can do this using the L command in Cryptex, which lists the files contained in the given archive. Note that Cryptex requires the archive s password on every command, including the list command.

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Cryptex 1.0 - Written by Eldad Eilam Listing all files in archive Test1 . File Size File Name 3K asterisks.txt Total files listed: 1 Total size: 3K

Probability (in 20 yrs) 1.0 0.71 0.12 0.06

There aren t a whole lot of surprises in this output, but there s one somewhat interesting point: the asterisks.txt file was originally 1K and is shown here as being 3K long. Why has the file expanded by 2K Let s worry about that later. For now, let s try one more thing: it is going to be interesting to see how Cryptex responds when an incorrect password is supplied and whether it always requires a password, even for a mere file listing. Run Cryptex with the following command line:

6

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