Journal
OPTICS AND LASERS IN ENGINEERING
Volume 50, Issue 2, Pages 248-255Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.optlaseng.2011.08.006
Keywords
Information security; Random blocking; Pixel scrambling
Categories
Funding
- National Natural Science Foundation of China [11104049, 10974039, 11047153]
- Specialized Research Fund for the Doctoral Program of Higher Education [20102302120009]
- Harbin Institute of Technology [HITQNJS. 2008. 027]
- Fundamental Research Funds for the Central Universities [HIT.NSRIF.2009038]
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Based on Arnold transform and discrete fractional angular transform, a double image encryption algorithm is designed. Two original images are regarded as the amplitude and phase of a complex function. Arnold transform is introduced for scrambling the pixels at a local area of the complex function. Subsequently the changed complex function is converted by discrete fractional angular transform. The operations mentioned will be performed many times. The amplitude of final output complex function is the encrypted image and its phase is regarded as the key of encryption algorithm. The parameters of the two transforms serve as the additional keys for enhancing the security. Some numerical simulations have been done to validate the performance of this encryption scheme. (C) 2011 Elsevier Ltd. All rights reserved.
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