A NEW APPROACH TO COLOR IMAGE SECRET SHARING (ThuAmPO3)

Author(s) : Rastislav Lukac (University of Toronto, Canada) Konstantinos Plataniotis (University of Toronto, Canada) Bogdan Smolka (Silesian University of Technology, Poland) Anastasios Venetsanopoulos (University of Toronto, Canada)

Abstract : A new secret sharing scheme for color images is introduced. Using the {k,n}-secret sharing strategy the proposed method encrypts the color image into $n$ color shares. The secret information is recovered only if the k (or more) allowed shares are available for decryption. Both encryption and decryption operations are performed by operating at the bit-levels of the decomposed color image. Modifying the spatial arrangements of the binary components the method produces color shares which vary in both the spectral characteristics among the RGB components and the spatial correlation between the neighboring color vectors. Since encryption is performed in the decomposed binary domain, there is no obvious relationship in the RGB color domain between any two color shares or between the original color image and any of the n shares. This increases protection of the secret information. Inverse cryptographic processing of the shares must be realized in the decomposed binary domain and the procedure reveals the original color image with perfect reconstruction.

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