Joint image compression and encryption based on alternating transforms with quality control

Peiya Li, Kwok Tung Lo

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

10 Citations (Scopus)


In this paper, we propose a novel joint image compression and encryption technique where an annoying image can still be recovered even without the encryption key. Our work is based on JPEG standard. By embedding encryption algorithm at the transformation stage, we realize image encryption and compression together with controllable image quality. Instead of using the 8×8 discrete cosine transform (DCT) alone for transformation, we develop new orthogonal transforms by introducing sign-flips into the butterflies of DCT's flow-graph structure, and then employ them alternatively in JPEG's transformation stage according to a secret key. By carefully selecting the butterflies for sign-flipping, we can control the visual quality of the encrypted images. Finally, a detailed security analysis of our proposed encryption algorithm is presented to show its resistance to various attacks, such as cryptographic attack, replacement attack and statistical model-based attack.
Original languageEnglish
Title of host publication2015 Visual Communications and Image Processing, VCIP 2015
ISBN (Electronic)9781467373142
Publication statusPublished - 21 Apr 2016
EventVisual Communications and Image Processing, VCIP 2015 - Singapore, Singapore
Duration: 13 Dec 201516 Dec 2015


ConferenceVisual Communications and Image Processing, VCIP 2015


  • Image encryption
  • JPEG standard
  • orthogonal transforms
  • quality control
  • security analysis

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Signal Processing

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