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This paper presents speech encryption based on four-dimensional hyperchaotic systems. Higher order chaotic systems can generate pseudo random numbers (PRN) of more complex dynamical properties. Hyper chaotic sequence is proofed with good randomness and unpredictability. In this approach, the speech scrambles are compressed by DCT to reduce residual intelligibility. Coefficients are then masked by...
In recent years, owing to the rapid growth of multimedia data transmission over the Internet, security is an important concern in the transmission and storage of digital images. Encryption is one of the most efficient and common practice to uplift image security. Many approaches for image encryption have been introduced including image encryption using chaotic sequences. Recently, the Coupled Map...
Digital data transmitted through the internet can be copied and can be used in malicious ways. This may cause problems referring to the protection of intellectual rights and the integrity of the transmitted information. Watermarking has emerged as a new technology to resolve these problems, providing both copyright claiming mechanisms and integrity verification tools. A novel image authentication...
The possibility of using chaos for the encryption and decryption of message signals in communication systems has been widely used and accepted. Hyperchaotic dynamics of high dimensionality is featured in chaos generated by systems with delayed nonlinear feedback. An efficient and fast encryption and decryption scheme exploiting hyperchaotic regimes of a nonlinear oscillator with time delay feedback...
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