A color image encryption algorithm is proposed based on the position index and chaos theory. First, the plain image is decomposed into its constituent red, green, and blue channels, each of which is resized to form one-dimensional arrays. Then, a permutation mechanism based on the position index values is introduced to effectively decrease the correlation between adjacent pixels by dynamically swapping the pixels of the three components. The Tent–Sine system is employed as a pseudorandom sequence generator to provide chaotic sequences in which the initial values and parameters are calculated from the Secure Hash Algorithm (SHA)-256 hash of the plain image. As a result, the algorithm is sensitive to the plain image. In addition, in contrast to the traditional ciphertext feedback mode, each pixel is modified based on the order of the position index sequences. The results of experimental simulations and extensive cryptanalyses indicate that the algorithm satisfactorily resists various typical attacks.
You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither SPIE nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the SPIE website.