Authors
Norberto Degara-Quintela, Fernando Perez-Gonzalez
Publication date
2003/6/20
Conference
Security and Watermarking of Multimedia Contents V
Volume
5020
Pages
413-422
Publisher
SPIE
Description
A novel technique allowing secure transmission/storage of electronic documents in printed form is described. First, given a document to protect, an error resilient "visibly encrypted" version is printed. Later, when the original document is to be recovered, the system scans the "visibly encrypted" document and decrypts it after asking for a secret key. Unfortunately, one faces the problem that when a document is printed and scanned, the rescanned document may look similar to the original, but will be distorted during the process. Therefore, to ensure reliable and high rate transmission over the print-and-scan channel it is essential a judicious theoretical model for characterizing the problem and providing reliable communications schemes. The proposed method is based on Pulse Amplitude Modulation (PAM), using small square-shaped pulses and a Maximum Likelihood (ML) detector that is derived after estimating the …
Total citations
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Scholar articles
N Degara-Quintela, F Perez-Gonzalez - Security and Watermarking of Multimedia Contents V, 2003