Research And Implementation Of Digtial Image Encryption Algorithm Based On Turbo Code

In order to further strengthen the safty reliability, the real-time properties in the transmission of the digital image,the encryption algorithm based on Turbo code is studied,and effective image encryption is designed and realized in the paper.Turbo code's developing situation and research status is firstly introduced in the paper,then through reseaching the scrambling Arnold image encryption algorithm, the encryption algorithm on the basis of Turbo encoder structure is proposed.The system is achieved through the following programs:the first one is the iteration thought. Once the three to five times are adopted as the iteration convergence,the curve of bit error rate is rapidly conveged. Three times are choosed as the iteration.Double encryption methods.Before being sent into the encryption device, the digtal image is disturbed outside to realize encryption for the first time,then it is encrypted by turbo encryption device secondly. The key is double keys,consists of encryption keys of external interweaver disturbed module and turbo code respectively. Interweaver thought. The greatest advantage is that the correlation of original data is reduced due to interweaver.So using convolution code and stochastic interwoven just have reached the random interwoven purpose. According to the order of certain data block arrangement in interwoven algorithm, which can play a better confidentiality of the effect.Through the experimental analysis, iteration reducibility exsit in scrambling encryption,it has some of the factors.The simulation experiments of histogram,the comentropy and the correlation are used to evaluate the turbo encryption algorithm. The results of the study demonstrate that the algorithm has a better reliability, efficiency and safety.