Hacking Exposed Linux, 3rd Edition [PDF]

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Hacking Exposed Linux, 3rd Edition Book

Sometimes you can find an unknown filesystem, a swap area, or a hibernation file, or you’ll simply want to extend your reach into unallocated clusters. In these scenarios, you could use a file carver to retrieve data. File carvers are powerful beasts that must be used with care as they will easily overload you with information if you don’t use them wisely.

File carving is the term used to analyze a given set of information (usually a large set) for known headers and footers of known file formats in order to be able to grab the data that sits in between and effectively “carve” it out.

That’s where the name comes from! There are other techniques to enhance carving and you’ll be seeing a lot of progress in this area in the very immediate future; soon file carving will eat as many resources as password cracking—just wait and see… but let’s keep to simple header/footer carving for now.