A Fast Image-Scramble Method using Public-Key Encryption (WP-P7)

Author(s) : Osamu Watanabe (Tokyo Metropolitan University, Japan) Akiko Nakazaki (Tokyo Metropolitan University, Japan) Hitoshi Kiya (Tokyo Metropolitan University, Japan)

Abstract : A new method for partial-scrambling of JPEG2000 images based on public-key encryption is proposed. By using public-key encryption, the proposed method provides an easier way of managing the encryption key compared with the secret-key based method and also provides tamper resistance against attacks. Although public-key encryption is usually very time-consuming, the proposed method achieves fast encryption by controlling the number of bytes to be encrypted. An encrypted JPEG2000 image generated by the proposed method has backward compatibility with a standard JPEG2000 image, so that it can be decoded using a standard JPEG2000 decoder. The proposed method also has scalability as to the degree of scrambling on the basis of JPEG2000 coding units, i.e., layers, DWT-levels, subbands, or code-blocks.

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