A new speech scrambling concept based on Hadamard matrices

Šenk, V.; Delić, Vlado; Milosevic, V.

doi:10.1109/97.586036

Cited by 24 publications

(21 citation statements)

References 10 publications

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“…A Hadamard matrix can be transformed to a new Hadamard matrix by a permutation of the rows and columns or by multiplication of the rows and columns by a factor . In this way we can obtain so-called -equivalent matrices of order , where some of them are identical [20]. Furthermore, a Hadamard matrix is -normalized when every element of the first row and first column is equal to .…”

Section: Note On the Encryptionmentioning

confidence: 99%

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Image Scrambling Without Bandwidth Expansion

Ville

Philips

Walle³

et al. 2004

IEEE Trans. Circuits Syst. Video Technol.

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Abstract-Image-scrambling schemes are designed to render the image content unintelligible. Wyner has proposed an elegant one-dimensional (1-D) scrambling scheme without bandwidth expansion, making use of the discrete prolate spheroidal sequences (DPSS). The DPSS are optimal regarding their energy concentration in a given frequency subband. In this paper, we propose the two-dimensional (2-D) extension and application of this algorithm. We discuss new possibilities introduced by the 2-D approach. We also include experimental results.

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Section: Note On the Encryptionmentioning

confidence: 99%

“…However, many of these possible keys produce only a small change of the coefficients. Another option, based on an article ofŠenk [20], is to consider (normalized) Hadamard matrices.…”

Section: Note On the Encryptionmentioning

confidence: 99%

Image Scrambling Without Bandwidth Expansion

Ville

Philips

Walle³

et al. 2004

IEEE Trans. Circuits Syst. Video Technol.

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“…The planned DSP based security of communication system and Transmitter and Receiver using UDP protocol, the system is shown as in Figure (6).…”

Section: Encryption and Decryption For Wirelessmentioning

confidence: 99%

“…In multi-resolution analysis, the average signal at one level is sent to another set of filters ( Fig. 1), which produces the average and detail signals at the next octave [6,12].…”

Section: The Basics Of Waveletmentioning

confidence: 99%

Design of Secure Ad Hoc Network Using Three Dimensional Discrete Wavelet Transformation Based on Performance Enhancement

Abdul-Rahaim¹,

Muneer²

2015

AJNC

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This work shows new and efficient algorithm of cryptographic purpose based symmetric and conventional techniques that considers the representation of the cipher text by using the three dimensional Discrete Wavelet Transform to find the wavelet decomposition vector containing the approximation and the detail coefficients then build the three dimensional data structure approach. The decryption is done by extracting the encrypted data from the wavelet decomposition vector using the algorithm of inverse Discrete Wavelet Transformation. The encrypted message consists the wavelet decomposition vector. The key is used for authorization purpose to access the network. Results shows great data security and BER over wireless channels based Ad Hoc network.

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“…The first one is content protection through encryption, e.g., speech scrambler [2][3][4][5][6][7][8][9]. Proper decryption of the data requires a key or the so-called scrambling matrix.…”

Section: Introductionmentioning

confidence: 99%

Scrambling-based speech encryption via compressed sensing

Zeng

Zhang

Chen

et al. 2012

EURASIP J. Adv. Signal Process.

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Conventional speech scramblers have three disadvantages, including heavy communication overhead, signal features underexploitation, and low attack resistance. In this study, we propose a scrambling-based speech encryption scheme via compressed sensing (CS). Distinguished from conventional scramblers, the above problems are solved in a unified framework by utilizing the advantages of CS. The presented encryption idea is general and easily applies to speech communication systems. Compared with the state-of-the-art methods, the proposed scheme provides lower residual intelligibility and greater cryptanalytic efforts. Meanwhile, it ensures desirable channel usage and notable resistibility to hostile attack. Extensive experimental results also confirm the effectiveness of the proposed scheme.

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A new speech scrambling concept based on Hadamard matrices

Cited by 24 publications

References 10 publications

Image Scrambling Without Bandwidth Expansion

Image Scrambling Without Bandwidth Expansion

Design of Secure Ad Hoc Network Using Three Dimensional Discrete Wavelet Transformation Based on Performance Enhancement

Scrambling-based speech encryption via compressed sensing

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