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Journal of Inforamtion Science and Engineering, Vol.18 No.3, pp.367-372 (May 2002)

A Note on Efficient Color Visual Encryption

Ching-Nung Yang
Department of Computer Science and Information Engineering
National Dong Hwa University
Hualien, 974 Taiwan
E-mail: cnyang@mail.ndhu.edu.tw

Rijmen and Preneel [1] proposed the colored VSS (Visual Secret Sharing) scheme, which only needs m sub pixels to represent m! colors. However, the number of possible colors does not really reach m! but only about m!/2 for large m. In this note, we will show this error and also give a correction for the Rijmen-Preneel scheme.

Keywords: visual cryptography, secret sharing scheme, visual secret sharing scheme, color visual cryptography, 2-out-of-2 VSS scheme

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Received April 2, 2001; revised; accepted December 19, 2001
Communicated by Ja-Ling Wu.