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RISS 인기검색어
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- 저자 : Dongning Zhao (검색결과 2 건)
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A Semi-fragile Image Watermarking Scheme Exploiting BTC Quantization Data
( Dongning Zhao ),( Weixin Xie ) 한국인터넷정보학회 2014 KSII Transactions on Internet and Information Syst Vol.8 No.4
This paper proposes a novel blind image watermarking scheme exploiting Block Truncation Coding (BTC). Most of existing BTC-based watermarking or data hiding methods embed information in BTC compressed images by modifying the BTC encoding stage or BTC-compressed data, resulting in watermarked images with bad quality. Other than existing BTC-based watermarking schemes, our scheme does not really perform the BTC compression on images during the embedding process but uses the parity of BTC quantization data to guide the watermark embedding and extraction processes. In our scheme, we use a binary image as the original watermark. During the embedding process, the original cover image is first partitioned into non-overlapping 4×4 blocks. Then, BTC is performed on each block to obtain its BTC quantized high mean and low mean. According to the parity of high mean and the parity of low mean, two watermark bits are embedded in each block by modifying the pixel values in the block to make sure that the parity of high mean and the parity of low mean in the modified block are equal to the two watermark bits. During the extraction process, BTC is first performed on each block to obtain its high mean and low mean. By checking the parity of high mean and the parity of low mean, we can extract the two watermark bits in each block. The experimental results show that the proposed watermarking method is fragile to most image processing operations and various kinds of attacks while preserving the invisibility very well, thus the proposed scheme can be used for image authentication.
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A New Ultra Lightweight Encryption Design for Security at Node Level
Ting Wang,Dongning Zhao,Zhiwei Sun,Weixin Xie 보안공학연구지원센터 2016 International Journal of Security and Its Applicat Vol.10 No.12
This paper proposes a new lightweight cipher VAYU. VAYU has a balanced Feistel structure. VAYU cipher supports 64 bit plaintext and 128/80 bit key length and it has a total of 31 rounds. It needs only 1290 GEs for 128 bit key length. It also results in minimal memory size as compared to all other existing lightweight ciphers. This paper discusses the security analysis of VAYU cipher design which is adequate against linear and differential cryptanalysis, Biclique attack, zero correlation attack, algebraic attack. VAYU cipher design will be best suitable for applications like IoT, smart Wireless Sensor networks. VAYU cipher uses two F-functions with substitution box, which results in a high diffusion mechanism.
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