• Journal of the Korea Institute of Information Security & Cryptology
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• v.18 no.3
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• pp.143-154
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• 2008

Information hiding is a very important technology recently. Having this technology can be a competitive power for secure communication. In this paper, it will be showed that hiding data in MS Office 2007 file is possible. Considering Microsoft (MS) Office 2007 file format is based on Open XML format, the feature of Open XML format makes it possible to hide data in MS Office 2007 file. In Open XML format, unknown XML files and their relationships can be defined by user. These parts and relationships are used to hide data in MS Office 2007 file. Considering unknown parts and unknown relationships are not in normal MS Office 2007 file, the hidden data can be detected by confirming of unknown parts and unknown relationships.