February 2026
Intermediate to advanced
456 pages
17h 3m
English
Content preview from Digital Forensics, Investigation, and Response 5E, 5th Edition
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Encryption
Cryptography is not so much about hiding a message, as with steganography, but rather about obfuscating the message so that it cannot be read. In other words, with steganography, the examiner may not even be aware a message is present. With cryptography, it is obvious there is a message present, but the examiner cannot easily decipher the message. The word cryptography is derived from word kryptós, which means hidden, and the verb gráfo, which means I write. Therefore, cryptography is the study of writing secret messages.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.