期刊
JOURNAL OF VISUAL COMMUNICATION AND IMAGE REPRESENTATION
卷 40, 期 -, 页码 51-57出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jvcir.2016.06.005
关键词
Image encryption; Chaos theory; Key schedule; Attacks; Key space
资金
- UTAR through the UTAR Research Fund [UTARRF 6200/Y43]
- Ministry of Education's Fundamental Research Grant Scheme (FRGS) under project ProvAdverse
One of the general ways in designing a secure image encryption algorithm based on chaos theory is to derive a number of round subkeys from the Key Schedule algorithm under the control of an external secret key. A compulsory condition for the security of an image encryption algorithm is that the length of the external secret key should be sufficiently long in terms of bitlength. However, the sufficiently long secret key is not a guarantee that the algorithm is secure. In this paper, we emphasize the importance in designing a secure Key Schedule algorithm for such image based encryption techniques. Notably, we show why the effective space spanned by the subkeys should never be smaller than the external secret key space. To highlight the importance of this, we present our attacks on three recently proposed image encryption schemes. (C) 2016 Elsevier Inc. All rights reserved.
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