R. G. van Schyndel, A. Z. Tirkel, and I. D. Svalbe. Key independent watermark detection. In Proceedings of the IEEE International Conference on Multimedia Computing and Systems, volume 1, pages 580-585, 1999.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....a correlation appears between the signal and a transformation of the signal. The embedded values are the private keys and the transformation matrix the public key. 3. 1 Legendre sequence insertion The first scheme based on this technique was introduced by van Schyndel, Tirkel and Svalbe in [14]. They embed a Legendre sequence in the signal. The Legendre sequence is invariant in a Fourier transform. Therefore it correlates with its conjugate Fourier transform. The private key is the Legendre symbol embedded and the public key is the length of the sequence. 3.2 Eigenvector insertion The ....

R. G. van Schyndel, A. Z. Tirkel, and I. D. Svalbe. Key Independent Watermark detection. In IEEE International Conference on Multimedia Computing and Systems, volume 1, 1999. 4

....whether a watermark is found ( T ) or not ( 0 ) g Embed Attack Detection 0 k I I private key public key Figure 1: General asymmetric watermarking scheme. In this paper we discuss a public key watermark detection scheme which is a modification of a proposal by van Schyndel et al. [3]. We briefly review the scheme proposed in [3] and then discuss a modification called eigenvector watermarking. A rough estimation for the necessary signal length enabling robust public detection is given, which is valid for van Schyndel s and our new scheme. Further, we discuss the security and ....

....( 0 ) g Embed Attack Detection 0 k I I private key public key Figure 1: General asymmetric watermarking scheme. In this paper we discuss a public key watermark detection scheme which is a modification of a proposal by van Schyndel et al. 3] We briefly review the scheme proposed in [3] and then discuss a modification called eigenvector watermarking. A rough estimation for the necessary signal length enabling robust public detection is given, which is valid for van Schyndel s and our new scheme. Further, we discuss the security and robustness in the presence of malicious ....

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R. G. van Schyndel, A. Z. Tirkel, and I. D. Svalbe. Key independent watermark detection. In Proceedings of the IEEE Intl. Conference on Multimedia Computing and Systems, volume 1, Florence, Italy, June 1999.

....of the public signal, modify only its absolute values and use the inversely transformed data as the attacked public signal r . This attack is successful without decreasing the signal quality since mainly watermark components are filtered out. 4. 3 Legendre Watermarking Van Schyndel et al. [12] proposed an asymmetric watermarking scheme based on a length N Legendre sequence a. Legendre sequences have a simple relationship to their DFT, namely Gw:Ta = A = A a , where Gw:T is the DFT matrix, the scalar A can be complex, and a denotes the conjugate Legendre sequence. Large letters, e.g. ....

R. G. van Schyndel, A. Z. Tirkel, and I. D. Svalbe. Key independent watermark detection. In Proc. of the IEEE Intl. Conf on Multimedia Computing and Systems, volume 1, Florence, Italy, June 1999. 10

....spectrum of the public signal, modify only its absolute values and use the inversely transformed data as the attacked public signal r. This attack is successful without decreasing the signal quality since mainly watermark components are filtered out. 4. 3 Legendre Watermarking Van Schyndel et al. [12] proposed an asymmetric watermarking scheme based on a length N Legendre sequence a. Legendre sequences have a simple relationship to their DFT, namely #### a # A # A # a ; where #### is the DFT matrix, the scalar A # can be complex, and a denotes the conjugate Legendre sequence. Large ....

R. G. van Schyndel, A. Z. Tirkel, and I. D. Svalbe. Key independent watermark detection. In Proc. of the IEEE Intl. Conf. on Multimedia Computing and Systems, volume 1, Florence, Italy, June 1999. 10

....indicates whether a watermark is found ( 1 ) or not ( 0 ) Embed Attack Detection x s r 0 1 private key public key Figure 1: General asymmetric watermarking scheme. In this paper we discuss a public key watermark detection scheme which is a modification of a proposal by van Schyndel et al. [3]. We briefly review the scheme proposed in [3] and then discuss a modification called eigenvector watermarking. A rough estimation for the necessary signal length enabling robust public detection is given, which is valid for van Schyndel s and our new scheme. Further, we discuss the security and ....

....not ( 0 ) Embed Attack Detection x s r 0 1 private key public key Figure 1: General asymmetric watermarking scheme. In this paper we discuss a public key watermark detection scheme which is a modification of a proposal by van Schyndel et al. 3] We briefly review the scheme proposed in [3] and then discuss a modification called eigenvector watermarking. A rough estimation for the necessary signal length enabling robust public detection is given, which is valid for van Schyndel s and our new scheme. Further, we discuss the security and robustness in the presence of malicious ....

[Article contains additional citation context not shown here]

R. G. van Schyndel, A. Z. Tirkel, and I. D. Svalbe. Key independent watermark detection. In Proceedings of the IEEE Intl. Conference on Multimedia Computing and Systems, volume 1, Florence, Italy, June 1999.

....the need of storing and retrieving the mapping file and the hidden watermarks (considered as the secret keys) for watermark detection. It is believed that secret key detection will encumber the automation and portability of watermarking. We shall put more time on studying the public key issue [27]. This is because public key detection admits of reading the watermarks for everybody and of removing them only by an authorized person. Acknowledgment: The authors thank Dr. Martin Kutter for providing the color images shown in Fig. 4. 18 ....

R. van Schyndel, A. Z. Tirkel, and I. D. Svalbe, "Key Independent Watermark Detection", IEEE Inter. Conf. on Multimedia Computing and Systems, Italy, Vol. I, pp. 580-585, 1999.

....Cauerstr. 7 NT, 91058 Erlangen, Germany feggers,su,girodg LNT.de Submitted to EUSIPCO 2000 Tampere, Finland, Sep. 5 8, 2000 ABSTRACT Digital watermarks are signals embedded in multimedia data to allow copyright enforcement or to distinguish copies of the document. Van Schyndel et al. [3] proposed a public detection principle for Legendre sequences that allows watermark detection without explicit reference to the embedded signal. In this article some extensions of this scheme are considered, and the applicability of the scheme in practice is investigated. In particular, more ....

....watermark detector need to know only a public key, which gives not enough information to make watermark removal possible, is motivated in more detail in the final paper. In this paper we discuss a public key watermark detection scheme which is a modification of a proposal by van Schyndel et al. [3]. We briefly review the scheme proposed in [3] and then discuss a modification called eigenvector watermarking. We give a rough estimation for the necessary signal length enabling robust public detection, which is valid for van Schyndel s and our new schemes. Further, we discuss and compare the ....

[Article contains additional citation context not shown here]

R. G. van Schyndel, A. Z. Tirkel, and I. D. Svalbe. Key independent watermark detection. In Proceedings of the IEEE International Conference on Multimedia Computing and Systems (ICMCS 99), volume 1, Florence, Italy, June 1999. 3

....is possible even when the encoding losses are significant due to the smallness of the added dither signal or because of perturbation of the image due to noise added in the transmission channel. Legendre sequences have a second favorable property, in being invariant to Fourier transformation [11]. Without requiring knowledge other than the length of the encoding sequence, a strong cross correlation will be obtained between the encoded sequence and its Fourier transform. The message can thus be determined as being watermarked, without needing to disclose the watermark content, although the ....

R. van Schyndel, A. Z. Tirkel, I. D. Svalbe, "Key Independent Watermark Detection", IEEE International Conference on Multimedia Computing and Systems, Florence, Italy, Vol. 1, June 1999, pp. 580-585.

....Section 5 examines possible approaches to improve watermark security and robustness of angle based watermarks to attack. 2. The Embedded Watermark Array The array of angles chosen here to be embedded in the image are 2D generalised Legendre arrays, based on the generalised Legendre sequence [3,4,5]. Elements in such an array can be formed as a term by term product of row and column generalised 1D Legendre sequences. The 1D sequences are comprised of a prime number, p, of unit magnitude vectors, with an alphabet of selected phase angles uniformly spread over the unit circle, corresponding ....

R. G. van Schyndel, A. Z. Tirkel, I. D. Svalbe., "Key Independent Watermark Detection", Accepted for presentation by ICMCS99, Florence, Italy, June 7-11, 1999.

....properties that may not make it appropriate for use as watermarks (they are not strictly pseudo noise) and this can cause ambiguity problems. A useful feature of the Legendre sequence, in its characteristic phase, is its invariance to the Fourier Transform operation. In related work, van Schyndel [29] shows that it is possible to test, under certain conditions, for the existence of a watermark using this sequence by cross correlating the watermarked image with its Fourier transform. A stego analyst (a third party trying to decipher the watermark) would, on disassembly of our detector, only ....

R. G. van Schyndel, A. Z. Tirkel, I. D. Svalbe, "Key Independent Watermark Detection", Submitted to ICMCS-99, Florence, Italy, June 1999.

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R. G. van Schyndel, A. Z. Tirkel, and I. D. Svalbe. Key independent watermark detection. In Proceedings of the IEEE International Conference on Multimedia Computing and Systems, volume 1, pages 580-585, 1999.

No context found.

R. G. van Schyndel, A. Z. Tirkel, I. D. Svalbe, \Key independent watermark detection", in Proceedings of the IEEE International Conference on Multimedia Computing and Systems, volume 1, Florence, June 1999.

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