A New Image Encryption Method using Quad-tree based Fresnelet Transform
Young-Ho Seo, Yoon-hyuk Lee, Dong-Wook Kim · The Journal of the Korean Institute of Information and Communication Engineering · 2015
ABSTRACT This paper proposes a new method which traces significant element of 2-dimensional natural images and encrypts them by using Fresnelet transform (FRNLT). After analyzing property of the subbands obtained by the FRNLT, we estimated the information for ciphering 2D images. Considering FRNLT levels, energy of subbands, and visual effect, we estimated the optimized point for encryption. By selecting various levels and encrypting region, we can encrypt 2D image with various robustness. Encryption effectiveness was showed by analyzing numerical result, executing time for encryption, area of encrypted region, and visual observation. Therefore encryption for various application can be applied by using the suggested parameters without additional analysis. Identifying the experimental result, in the case of and , an image was not recognized through encrypting only 0.42% among the entire data. 키워드 : 암호화, 이산 프레넬릿 변환, 쿼드트리, 부대역 에너지 Key word : Encryption, Discrete Fresnelet Transform, Quad Tree, Subband EnergyJournal of the Korea Institute of Information andCommunication Engineering