الفهرس 
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Abstract
The expansion of the Internet has frequently increased the availability of digital multimedia to the public. Digital multimedia can be manipulated or reproduced easily without the loss of information by using powerful multimedia processing tools that are widely available. In particular, safe distribution and management of multimedia content have become the real challenge. To satisfy these needs, several techniques have been developed among them digital watermarking and encryption. Encryption provides a means for secure delivery of multimedia content to the consumer. Legitimate consumers are provided with a key to decrypt the content. Actually, encrypted data need an additional level of protection in order to keep control on them after the decryption phase. On the other hand, one may want to check the presence of a watermark without decrypting the data. Therefore, the challenging goal seems to be the achievement of both levels of protection simultaneously in order to allow jointly exploiting the benefits of the two mechanisms. In this thesis, Four hybrid encryption-watermarking algorithms are proposed. In the first one, we proposed a robust watermarking scheme that is based on DWT, DCT and SVD transform domains. The proposed robust watermarking scheme is combined with a proposed chaos-based encryption algorithm for the purpose of copyright protection. The other three hybrid algorithms are proposed for the purpose of digital images content authentication with tamper detection and localization. Compared to traditional and most recent existing algorithms, experimental results demonstrated that the proposed hybrid algorithms are highly efficient and secure.