الملخص

The researchers was interest in the issue of security from long time ago  even  arrived to the current age (the digital age), and because of the importance of this topic and the challenges in it, so this work which included  study and application of new algorithm is proposed to achieve a high level of  security by encrypting the secret message  (image) using the Logistic  Chaotic  function  after the implementation of  Discrete Wavelet Transform (DWT). In the next  phase, it has been implemented the  Discrete Cosine Transform (DCT)  on the cover (image) and then hide the secret message within encrypted data in which  the adoption of the principle of random Blocks which is determined  by  chaotic series. Deliberately proposed algorithm to provide more of an advantage in it's work, provide ingreliability through data encryption,  message  security, and provided a very high degree of security  through the adoption of the principle of random selected passages  Chaotic, increasing the efficiency of the work of the algorithm and the degree of security. After the application it must be the use of performance measurements,  so the following was used (NC, BER, PSNR, MSE). The language was  Matlab9.