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access icon free Colour image encryption algorithm using one-time key and FrFT

  • Author(s): Zhenguo Gao 1 ; Danjie Chen 1, 2 ; Wei Zhang 3 ; Shaobin Cai 1
    • View affiliations
  • Source: Volume 12, Issue 4, April 2018, p. 472 – 478
    DOI:  10.1049/iet-ipr.2017.0383 , Print ISSN 1751-9659, Online ISSN 1751-9667
© The Institution of Engineering and Technology
Received 20/04/2017, Accepted 12/11/2017, Revised 23/10/2017, Published 17/11/2017

A novel chaos-based colour image encryption algorithm is proposed, which adopts a one-time key mechanism based on message-digest algorithm 5 (MD5) value of the input plain image. The algorithm combines several key technologies including fractional Fourier transform (FrFT), MD5, and global scrambling. Using fast digital discrete FrFT, the algorithm develops the complex data manipulating potentials of FrFT efficiently; meanwhile, keeps the size of the cipher image un-changed, thus eliminates the requirement on double storage space to store complex values of cipher image. Exploiting the intrinsic robustness of FrFT, the algorithm achieves high robustness to pixel errors and noise attacks. Experimental results show that the algorithm achieves better pixel change rate and unified average change intensity, and is efficient, effective, and robust to attacks.

Inspec keywords: image colour analysis; discrete Fourier transforms; cryptography

Other keywords: message-digest algorithm 5; digital discrete FrFT; one-time key; pixel errors; noise attacks; novel chaos-based colour image encryption algorithm; cipher image; fractional Fourier transform

Subjects: Optical, image and video signal processing; Data security; Cryptography; Computer vision and image processing techniques; Integral transforms; Integral transforms

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