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A picture can tell a thousand words, but it may also be used to hide them, too. Steganography involves hiding information inside other information. Text can be hidden in images, sound files, or even other text. The methods for doing this, and for detecting it when it happens, have evolved over time. David Frith, senior consultant at Siemens Insight Consulting, explains the history and future of steganography, and discusses some of the techniques both for doing it, and undoing it. This article offers an explanation of how steganography works, its limitations and the various approaches used. It also reviews some of the implications of hidden encryption for those who fight it and the various detection options and tools that can be used.