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A Reversible Data Hiding Method for Encrypted Images

William Puech, Marc Chaumont, Olivier Strauss

Electronic Imaging, Jan 2008, San Jose, CA, United States.
SPIE/IS&T, SPIE (6819), pp.68191E, 2008


Since several years, the protection of multimedia data is becoming v ery important. The protection of this multi- media data can be done with encryption or data hiding algorithms. To dec rease the transmission time, the data compression is necessary. Since few years, a new problem is trying to combine in a single step, compression, encryption and data hiding. So far, few solutions have been proposed to combine image encryption and com- pression for example. Nowadays, a new challenge consists to embed data in encrypted images. Since the entropy of encrypted image is maximal, the embedding step, considered like noise, is not possible by using standard data hiding algorithms. A new idea is to apply reversible data hiding algor ithms on encrypted images by wishing to remove the embedded data before the image decryption. Recent re versible data hiding methods have been proposed with high capacity, but these methods are not applicable on enc rypted images. In this paper we propose an analysis of the local standard deviation of the marked encrypted images i n order to remove the embedded data during the decryption step. We have applied our method on variou s images, and we show and analyze the obtained results.

Choose the method option

Encoding : AES encryption of the image, then Data Hiding message
Decoding : Extraction of the hidden message, then decryption and message removing