With the wide application of multimedia data, multimedia content protection becomes urgent. Until now, various means have been reported that can be classified into several types according to their functionalities, such as data encryption, digital watermarking, or data authentication. They are used to protect multimedia data's confidentiality, ownership, and integrity, respectively. A wavelet-based multifeature semifragile multimedia authentication scheme is proposed. According to the approximation component and the energy relationship between the subbands of the detail component, global feature and local feature are both generated. Then, the global watermark and local watermark are generated from global feature and local feature, respectively. Two watermarks are then embedded into the multimedia data themselves, in the wavelet domain. Both the feature extraction and embedding processes are controlled by secret keys to improve the security of the proposed scheme. On the receiver side, the extracted watermark and the one generated from the received image are compared to determine the tampered location. A new authentication method is designed, and it is proved valid in the experiments. This authentication scheme is robust to general compression; sensitive to cutting, pasting, or modification; efficient in real-time operation; and secure for practical applications.
A commutative watermarking and encryption scheme is proposed for media data protection. In the scheme, the partial encryption algorithm is adopted to encrypt the significant part of media data, while some other part is watermarked. The commutative property brings conveniences to practical applications in secure media transmission or distribution.
In this paper, a secure multimedia browsing scheme is proposed, which is constructed based on perceptual multimedia encryption and secure key distribution. In this scheme, multimedia data are encrypted perceptually under the control of user key and quality factor. This encryption process combining with Advanced Video Coding (AVC) is of low cost, and keeps file format unchanged. The key distribution scheme deals with user input, authenticates users, and controls the secure multimedia sharing process. Thus, only the users who have registered can obtain multimedia data. And they can be classified into several types according to their payment. The analyses and experimental results show that it is suitable for secure multimedia applications such as Video-on-Demand (VOD) system, Audio-on-Demand (AOD) system, pay-TV, videoconferencing systems, wireless or mobile multimedia, and so on.
A secure image transmission scheme based on JPEG2000 codec is proposed in this paper, which combines encryption with encoding and is suitable for real-time applications. In this scheme, the sensitive data are self-authenticated, then partial-encrypted during compression process, and the compressed data are encrypted by the lightweight encryption algorithm combined with error-correction codec. The self-authentication process can detect malicious tampering or transmission errors. The encryption process obtains suitable tradeoff between security and time-efficiency through encrypting data adaptively, and keeps the original system's error-robustness. The decryption process is symmetric to the encryption process. Experimental results show that this scheme obtains high perception security and time efficiency, and is thus suitable for secure image transmission over network.
With the wide application of multimedia data, multimedia content protection becomes urgent. Till now, various means have been reported, which can be classified into several types according to their functionalities, such as data encryption, digital watermarking or data authentication. They are used to protect multimedia data's confidentiality, ownership and integrity, respectively. For multimedia data authentication, some approaches have been proposed. In this paper, a wavelet-based multi-feature semi-fragile authentication scheme is proposed. According to the approximation component and the energy relationship between the subbands of the detail component, global feature and local feature are both generated. Then, the global watermark and local watermark are generated from global feature and local feature, respectively. The watermarks are then embedded into the multimedia data themselves in the wavelet domain. Both the feature extraction and embedding processes are controlled by secret keys to improve the security of the proposed scheme. In the receiver end, the extracted watermark and the one generated from the received image are compared to determine the tampered location. A new authentication method is designed and it is proved valid in the experiments. This authentication scheme is robust to general compression, sensitive to cutting, pasting or modification, efficient in real-time operation, and secure for practical applications.
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