Journal
NONLINEAR DYNAMICS
Volume 82, Issue 4, Pages 1839-1850Publisher
SPRINGER
DOI: 10.1007/s11071-015-2281-0
Keywords
Chaos; Substitution; Diffusion; Cryptography; Image encryption
Categories
Funding
- National Research Foundation of Korea (NRF) - Ministry of Education [2014R1A-1A2054174]
- MSIP (Ministry of Science, ICT and Future Planning), Korea under the Global IT Talent support program [NIPA-2014H0905-14-1004]
- Ministry of Public Safety & Security (MPSS), Republic of Korea [H0905-14-1004] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In a single substitution box, the same regions (pixels) of an image are encrypted to one unique symbol. To reduce this type of autocorrelation in data, chaos has been extensively applied over the last decade. By using chaotic maps, a single substitution box has been replaced with multiple substitution boxes for the encryption of autocorrelated data. The technique of multiple substitution boxes is becoming very popular among cryptographic algorithm designers to overcome the drawbacks of a single substitution box. In this paper, however, we found that replacing a single substitution box with multiple substitution boxes cannot provide a general solution for highly autocorrelated data. To address this issue, we propose a novel technique by adding chaotic diffusion to the existing substitution process. Extensive security analyses show that the proposed algorithm achieves both higher-level security and fast encryption time when compared with existing algorithms.
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