Steganography: Hiding Data Within Data
Gary C. Kessler
September 2001

An edited version of this paper with the title "Hiding Data in Data" originally appeared in the April 2002 issue of Windows & .NET Magazine .

Cryptography — the science of writing in secret codes — addresses all of the elements necessary for secure communication over an insecure channel, namely privacy, confidentiality, key exchange, authentication, and non-repudiation. But cryptography does not always provide safe communication.

Consider an environment where the very use of encrypted messages causes suspicion. If a nefarious government or Internet service provider (ISP) is looking for encrypted messages, they can easily find them. Consider the following text file; what else is it likely to be if not encrypted?qANQR1DBwU4D/TlT68XXuiUQCADfj2o4b4aFYBcWumA7hR1Wvz9rbv2BR6WbEUsy
ZBIEFtjyqCd96qF38sp9IQiJIKlNaZfx2GLRWikPZwchUXxB+AA5+lqsG/ELBvRa......

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Title: Steganogrphy
Approximate Word Count: 2763
Approximate Pages: 12 (250 words per double-spaced page)

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