A comment on "Sharing secrets in stegoimages with authentication"
Recently, Chang et al.'s image secret sharing (ISS) scheme enhanced the weak authentication of two previous ISS schemes-Lin et al.'s scheme and Yang et al.'s scheme. Also, the authors claimed that the visual qualities of stegoimages were superior to the previous two schemes: however, their qualities were not really that improved. Contrarily, the qualities are significantly degraded when compared with those in Yang et al.'s scheme. This miscalculation is owing to a Misunderstanding of Yang et al.'s scheme. (C) 2009 Elsevier Ltd. All rights reserved.
authentication image secret sharing secret sharing steganography