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This paper describes a method for hiding data inside printed text documents that is resilient to print/scan and photocopying operations. Using the principle of channel coding with side information, the embedder inserts a message into a text document while treating the content of the document as known interference. The data is embedded by making small changes to text characters before the document is printed. Using a simple correlation-based detector in conjunction with an error correction code,doi:10.1109/icassp.2009.4959854 dblp:conf/icassp/VarnaRV09 fatcat:kzcueg2ygvcf3gqn6rp7ybpb2y