Renkli görüntüler için kriptografik şema

Due to the extensive use of multimedia applications, image coding standards are one of the ways that supported multimedia spreading. Internet is full of digital documents that are uploaded by thousands every second through social media or any websites for commercials or business. Encryption and decryption techniques are required for digital multimedia distribution. Today, privacy and authentication services are crucial for data dissemination through the Internet. This work focuses on image security integrating encryption with multimedia compression systems. Also, image encryption algorithms combining with JPEG encoding are also proposed. Three approaches for integrating encryption with image compression system are proposed. These are Color Plane Permutation, Discrete Cosine Transform (DCT) coefficients, and sign encryption of DCT coefficients. The proposed approaches are supported by selective encryption, are a portion of the coefficients from either the final results or intermediate steps of a compression system. The securities of the proposed approaches are also analyzed. Simulations results show that the proposed system is secure, low cost, and compatible with direct bit-rate control. These properties make the study suitable for multimedia applications with the real-time operation and image transmission.