29 April 2002 Sensitivity labels and invisible identification markings in human-readable output
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This paper presents a mechanism for embedding both immediately readable and steganographically hidden information in human-\-readable output, particularly in hard copy format. The mechanism is embedded within a domain inaccessible to unprivileged users in the operating system's Trusted Computing Base. A realization is presented which permits the embedding of such markings in arbitrary printing systems under the Microsoft Windows NT family of operating systems.
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Christoph Busch, Stephen D. Wolthusen, "Sensitivity labels and invisible identification markings in human-readable output", Proc. SPIE 4675, Security and Watermarking of Multimedia Contents IV, (29 April 2002); doi: 10.1117/12.465271; https://doi.org/10.1117/12.465271

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