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Cryptography: As described earlier in the sidebar of this section, encryption and steganography can be used together for added security Storing Information: Quite simply, steganography is a subset of information storage Steganography is used in combination with many types of storage technologies and techniques to maximize its effectiveness
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One of the major commercial uses for signal/noise steganography is digital watermarking With digital watermarking, the message being embedded is usually very small The purpose is not to communicate secretly; rather it s to secretly mark commercially valuable media to detect theft As a result, plenty of effort is put into making the watermark as robust as possible, capable of surviving extreme manipulation Tools for automatically detecting the watermark are also necessary There is more information on this topic in the digital watermarking section of the book Another area of development for signal/noise steganography is steganographic file systems The idea is to fill up a disk with cover files The real data is then steganographically stored in the cover files This requires a large amount of disk space, as only a portion of each cover file is noisy enough for hiding data Another variation is to fill the disk drive up with random data (noise) and then to write the
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312 Network Security Illustrated files onto the drive in a random-seeming manner One file might be spread out across the entire drive Only the file s owner has the code necessary to reconstruct the original file What s the point of a steganographic file system Why not just encrypt files for protection In the words of the creators of StegFS, a steganographic file system for Linux (taken from their web site): Assuming correctly implemented encryption software is used as designed, and cryptanalysis remains infeasible, an attacker can still chose among various tactics to enforce access to encrypted file systems Brief physical access to a computer is, for instance, sufficient to install additional software or hardware that allow an attacker to reconstruct encryption keys at a distance (UHF burst transmitters that can be installed by non-experts inside any PC keyboard within 10-12 minutes are now commercially available, as are eavesdropping drivers that will covertly transmit keystrokes and secret keys via network links) An entirely different class of tactics focuses on the key holders, who can be threatened with sanctions as long as there remains undecryptable ciphertext on their storage device Steganographic file systems are designed to give a high degree of protection against compulsion to disclose their contents A user who knows the password for a set of files can access it Attackers without this knowledge cannot gain any information as to whether the file exists or not, even if they have full access to the hardware and software They aim to provide a secure file system where the risk of users being forced to reveal their keys or other private data is diminished by allowing the users to deny believably that any further encrypted data is located on the disk Even more interesting is the combination of steganographic file systems and peer-to-peer networking Instead of hiding data on a single hard drive, the vast repository of audio and video data available on various peer-to-peer networks can be used as a source of cover files
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Steganography is an interesting technology that has many potential uses Unfortunately it has garnered a bad reputation in the last five years because of its association with evildoers The truth is that steganography is a security tool like any other Myriads of legitimate situations exist where it is used to add an extra layer of privacy to communications Conversely, many people who are hiding information are doing so because they are breaking the law, or have malintent In either case, steganography is an extremely effective way to communicate privately and ensure that no third parties are even aware a communication took place
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