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Bit-Level Image Encryption Algorithm Based on Composite Chaotic Mapping
Cai Yang,Haiyu Zhang,Jinliang Guo,Songhao Jia,Fangfang Li 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.8
Because the single chaotic mapping easily creates security weaknesses in the image encryption algorithm, the security needs to be improved. Aiming at this problem, a bit-level image encryption algorithm based on composite chaotic mapping (CCM-IEA) is proposed. First of all, the algorithm scrambles the plain image on bit level through the Cat mapping for the first time. And then the Henon mapping of two dimensional discrete is used to scramble for the second time. Finally, image diffusion is operated through the one dimensional Logistic mapping, and the data sensitivity is enhanced. The experimental results show that the performance of the CCM-IEA algorithm is better on the histogram, information entropy and correlation analysis. Compared with the single chaotic images encryption algorithm, the CCM-IEA algorithm has the ability to resist the information entropy analysis and correlation analysis. It can be seen that the CCM-IEA algorithm has high safety performance and good encryption effect.
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Xueli Dong,Jing Ji,Songhao Zhang,Danliu Peng,Yurong Wang,Lishuang Zhang,Jiali Li,Gang Wang 한국생물공학회 2022 Biotechnology and Bioprocess Engineering Vol.27 No.4
The biodegradation of straw by cellulosedegrading strains plays an important role in the disposal of agricultural waste. In this study, a Penicillium sp. strain JiTF01 that could degrade cellulose was isolated at the low temperature (10oC), and its fermentation conditions were optimized by response surface method. Strain JiTF01 was applied to degrade rice straw at 10oC. It was found that the straw degradation ratio could reach to 46.53% on the 25th day of culture with the enzyme activity of 44.30 U/mL under optimized fermentation conditions. In addition, given that strain JiTF01 showed excellent acid resistance and the cellulase produced by strain JiTF01 exhibited higher enzymatic activity and stability under acidic conditions, the uninterrupted integration process of acid pretreatment and acid fermentation of straw was then performed. The results showed that the degradation ratio of 53.61% was observed after 25 days of the fermentation at pH 3, which increased by 7.08% than that under optimized conditions. Besides, the effect of straw fermentation broth on the growth of rice seed was also investigated, and the 10-5 and 10-6 diluted fermentation broth was found that could significantly promote the growth of rice seedlings and enhance the germination rate of rice seeds under the salt stress of 100 and 200 mmol/L. The conclusions found in this article might have important implications for straw recycling in cold regions.
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