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检索条件"任意字段=Conference on Mathematics of Data/Image Coding, Compression, and Encryption VI, with Applications"

共 93 条记录，以下是51-60 订阅

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Unpuzzling Puzzle (analysis of a video encryption algorithm)

Unpuzzling Puzzle (analysis of a video encryption algorithm)

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International conference on Advanced Information Networking and applications (AINA)

作者： M. Stanek L. Stanekova Department of Computer Science Comenius University Bratislava Slovakia Department of Mathematics Slovak University of Technology Bratislava Slovakia

We analyze recently proposed encryption algorithm Puzzle, aimed at efficient (real time) encryption of video streams. We show some weaknesses in the generation of components used for encryption. Moreover, we present a... 详细信息

关键词： Algorithm design and analysis Cryptography Streaming media video compression video on demand videoconference Throughput image coding Security Computer science

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Proceedings of SPIE mathematics of data/image coding, compression, and encryption viII, with applications

Proceedings of SPIE Mathematics of Data/Image Coding, Compre...

引用

mathematics of data/image coding, compression, and encryption viII, with applications

The proceedings contain 21 papers. The topics discussed include: a cryptanalysis procedure of the data encryption standard;an adaptive watermarking scheme in the DCT domain;robust video watermarking using additional watermarking techniques;computational complexity of object-based image compression;error measures for object-based image compression;exploiting the distributed source coding paradigm for low-complexity compression of hyperspectral images;fast feature extraction in hyperspectral imagery via lifting wavelet transforms;deformable block motion compensation scheme for aerial video surveillance coding;minimax eigenvector decomposition for data hiding;and selective weighing on wavelet coefficients for blind image watermarking system.

关键词： Imaging systems

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A cryptanalysis procedure of the data encryption standard

A cryptanalysis procedure of the data encryption standard

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mathematics of data/image coding, compression, and encryption viII, with applications

作者： Silva G., victor Manuel CIDETEC IPN Avenida Te #950 C.P. 08400 Mexico D.F. Mexico

In this paper an attack strategy on the data encryption Standard (DES) that is different from the existing ones is developed. The attack strategy is based on a theorem proved by the author, called LR theorem. The attack can be done by means of a personal computer, i.e. a Pentium IV based machine. Obviously, more information than a sample of plaintext and ciphertext is required. However, this additional requirement is reduced to a minimum of just 24 bits. The LR theorem uncovers 16 trapdoors of which 2 are of importance. With this knowledge, an attack on Triple-DES can be performed using the aforementioned personal computer. A simple solution to this kind of attack is proposed, preserving the complexity of the Triple-DBS, 2112.

关键词： Cryptography

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On encryption-compression tradeoff of pre/post-filtered images

On encryption-compression tradeoff of pre/post-filtered imag...

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mathematics of data/image coding, compression, and encryption viII, with applications

作者： Gurijala, Aparna Khayam, Syed A. Radha, Hayder Deller Jr., J.R. Department of Electrical and Computer Engineering 2120 Engineering Building Michigan State University East Lansing MI 48824

Advances in network communications have necessitated secure local-storage and transmission of multimedia content. In particular, military networks need to securely store sensitive imagery which at a later stage may be transmitted over bandwidth-constrained wireless networks. This work investigates compression efficiency of JPEG and JPEG 2000 standards for encrypted images. An encryption technique proposed by Kuo et al. in [4] is employed. The technique scrambles the phase spectrum of an image by addition of the phase of an all-pass pre-filter. The post-filter inverts the encryption process, provided the correct pseudo-random filter coefficients are available at the receiver. Additional benefits of pre/post-filter encryption include the prevention of blocking effects and better robustness to channel noise [4]. Since both JPEG and JPEG 2000 exploit spatial and perceptual redundancies for compression, pre/post-filtered (encrypted) images are susceptible to compression inefficiencies. The PSNR difference between the unencrypted and pre/post-filtered images after decompression is determined for various compression rates. compression efficiency decreases with an increase in compression rate. For JPEG and JPEG 2000 compression rates between 0.5 to 2.5 bpp, the difference in PSNR is negligible. Partial encryption is proposed wherein a subset of image phase coefficients are scrambled. Due to the phase sensitivity of images, even partial scrambling of the phase information results in unintelligible data. The effect of compression on partially encrypted images is observed for various bit-rates. When 25% of image phase coefficients are scrambled, the JPEG and JPEG 2000 compression performance of encrypted images is almost similar to that of unencrypted images for compression rates in the 0.5 to 3.5 bpp range.

关键词： image compression

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Double random phase spread spectrum spread space technique for secure parallel optical multiplexing with individual encryption key

Double random phase spread spectrum spread space technique f...

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mathematics of data/image coding, compression, and encryption viII, with applications

作者： Hennelly, B.M. Javidi, B. Sheridan, J.T. Department of Electronic and Electrical Engineering Faculty of Engineering and Architecture University College Dublin Belfield Dublin 4 Ireland Department of Electrical and Computer Engineering University of Connecticut Storrs CT 06269-2157

A number of methods have been recently proposed in the literature for the encryption of 2-D information using linear optical systems. In particular the double random phase encoding system has received widespread attention. This system uses two Random Phase Keys (RPK) positioned in the input spatial domain and the spatial frequency domain and if these random phases are described by statistically independent white noises then the encrypted image can be shown to be a white noise. Decryption only requires knowledge of the RPK in the frequency domain. The RPK may be implemented using a Spatial Light Modulators (SLM). In this paper we propose and investigate the use of SLMs for secure optical multiplexing. We show that in this case it is possible to encrypt multiple images in parallel and multiplex them for transmission or storage. The signal energy is effectively spread in the spatial frequency domain. As expected the number of images that can be multiplexed together and recovered without loss is proportional to the ratio of the input image and the SLM resolution. Many more images may be multiplexed with some loss in recovery. Furthermore each individual encryption is more robust than traditional double random phase encoding since decryption requires knowledge of both RPK and a lowpass filter in order to despread the spectrum and decrypt the image. Numerical simulations are presented and discussed.

关键词： Spread spectrum communication

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Fractal based techniques and their applications

Fractal based techniques and their applications

引用

作者： Lai, Cheung-Ming Hong Kong Polytechnic University (Hong Kong)

学位级别：Ph.D.

The aim of this research is to develop efficient algorithms for fractal image coding, which can be applied in digital image compression, image magnification and image denoising. Fractal image coding can provide a highly reconstructed image quality with a high compression ratio, is independent of resolution, and has a fast decoding process. The problem with fractal coding is its high computational complexity in the encoding process. Most of the encoding time is spent finding the best-matched domain block from a large domain pool to represent an input range block with respect to contrast and intensity offset, as well as the isometry transformations. The objectives of this research are to investigate and develop efficient techniques for fractal image coding, fractal-based image magnification and denoising. In this thesis, four efficient fractal image-coding algorithms have been proposed. The first algorithm is based on new feature vectors and the property of zero contrast. The proposed feature vectors can provide a better representation of image blocks, and thus result in a more efficient search of the domain block. The second algorithm is an efficient windowing scheme for fractal image coding based on the local variances method. In our method, windows covering those domain blocks whose variances are higher than that of the range block are considered according to a mathematical model. The exhaustive search algorithm can obtain the optimal result by searching all the blocks within the domain pool, but this process requires a high computational cost, which limits its practical application. A single kick-out condition is proposed which can avoid a large number of range-domain block matches when finding the best-matched domain block. An efficient method for zero contrast prediction is also proposed, which can determine whether the contrast factor for a domain block is zero or not, and compute the corresponding difference between the range block and the transformed domain b

关键词： Hong Kong Polytechnic University -- Dissertations. image compression. image processing -- Digital techniques -- mathematics. Fractals. data encryption (Computer science)

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compression of encrypted three-dimensional objects using digital holography

Compression of encrypted three-dimensional objects using dig...

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Opto-Ireland 2005 conference

作者： Naughton, TJ Javidi, B Natl Univ Ireland Maynooth Dept Comp Sci Maynooth Kildare Ireland

ISBN: (纸本)0819458120

We present the results of applying data compression techniques to encrypted three-dimensional objects. The objects are captured using phase-shift digital holography and encrypted using a random phase mask in the Fresnel domain. Lossy quantisation is combined with lossless coding techniques to quantify compression rates. Lossless compression alone applied to the encrypted holographic data achieves compression rates lower than 1.05. When combined with quantisation and an integer encoding scheme, this rises to between 12 and 65 (depending on the hologram chosen and the method of measuring compression rate) with good decryption and reconstruction quality. Our techniques are suitable for a range of secure three-dimensional object storage and transmission applications.

关键词： digital holography image compression optical encryption three-dimensional image processing

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Crypto-compression of medical images by selective encryption of DCT

Crypto-compression of medical images by selective encryption...

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European Signal Processing conference (EUSIPCO)

作者： W. Puech J. M. Rodrigues Universite de Montpellier Montpellier Languedoc-Roussillon FR Laboratoire LIRMM Université Montpellier MONTPELLIER FRANCE

The traffic of digital images has grown rapidly in the Internet. Security of image becomes important for many sectors mainly for medical applications. Nowadays, the transmission of medical images is a daily routine, especially over wireless (battlefields, traffic accidents, etc). Partial encryption is an approach to reduce the computational resources for huge volumes of multimedia data in low power network. This paper presents a method of partial or selective encryption for JPEG images. It is based on encryption of some quantified DCT coefficients in low and high frequencies. We have combined compression and encryption in order to fully dissimulate the visual information of the image and to see the image in low quality resolution.

关键词： encryption Transform coding image coding Standards Discrete cosine transforms PSNR

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Proceedings - 3rd International conference on Intelligent Sensing and Information Processing, ICISIP 2005

Proceedings - 3rd International Conference on Intelligent Se...

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3rd International conference on Intelligent Sensing and Information Processing, ICISIP 2005

ISBN: (纸本)0780395883

The proceedings contain 42 papers. The topics discussed include: EEG artifact reduction in VEP using 2-stage PCA and N4 analysis of alcoholics;an efficient coding method for teleconferencing and medical image sequences;ecg signal compression using discrete SINC interpolation;hypergraphs: organizing complex natural neural networks;agent-oriented modelling of real-time systems for critical events;generic feature extraction for classification using fuzzy C-means clustering;efficient mining of contrast patterns and their applications to classification;disulphide bridge prediction using fuzzy support vector machines;audio steganalysis using ensemble of autonomous multi-agent and support vector machine paradigm;naive-Bayes classification using fuzzy approach;cryptanalysis of simplified data encryption standard via optimization heuristics;identifying temporal gene networks using signal processing metrics on time-series gene expression data;predict protein-protein interaction using heuristic approaches;a low complexity technique for data fusion in digital images and lossless retrieval;spectral estimation using constrained autoregressive (CAR) model;basins of attraction of cellular automata based associative memory and its rule space;and a multimodal audio visible and infrared surveillance system (MAviSS).

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Proceedings of SPIE: mathematics of data/image coding, compression, and encryption vi, with applications

Proceedings of SPIE: Mathematics of Data/Image Coding, Compr...

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mathematics of data/image coding, compression, and encryption vi, with applications

The proceedings contains 22 papers of SPIE : mathematics of data/image coding, compression, and encryption vi, with applications. The topics discussed include: natural language insensitive short textual string compression;techniques for region coding in object-based image compression;boundary representation techniques for object-based image compression;meitei coding for subband image compression;standards-compatible compression for automated image recognition in sensor networks and surveillance systems and non-MSE data compression for emitter location for radar pulse trains.

关键词： image compression

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