Design Of Mobile Terminal Digital Image Privacy Protection Scheme

In recent years, the rapid spread of mobile intelligent terminals and mobile Internet has changed people’s life style. But with the rapid expansion of mobile intelligent terminal, how to safely protect the user’s privacy becomes a very important issues. In recent days various privacy breaches show that the protection of mobile users` privacy information has serious shortcomings.This paper studied the protection of the mobile terminal users` digital images privacy. To simultaneously maintation the security and the easy accessablity of privacy data, this paper proposed a mobile terminal digital image privacy protection scheme which is combined with digital image encryption algorithm and one-time password authentication. The main work and results are as follows:1. To achieve the secure and easy access to user`s privacy digital image data which stored locally on the mobile terminal, a new local authentication scheme is proposed based on two conventional remote dynamic password authentication scheme,that is S/Key and SAS. The new local authentication scheme has a high safety and execution performance.2. Based on the n-depth research of Arnold transform which is widely used in the field of image encryption, this paper gives an independently proof of the periodic of Arnold transform. And proposed an Arnold digital image encryption algorithm based on sparse matrix, abbreviated as SMA(Sparse Matrix Arnold). And then proposed a security improved algorithm of SMA, by using the idea of combining image layering, abbreviated as 3SMA(3 round SMA), these two new both have a high execution performance.3. Experiments have been conducted to test the feasibility and security of SMA and 3SMA encryption algorithm has been tested.The main work are as follows:1) SMA and 3SMA algorithms has been tested, both two algorithms have good encryption effect, the ciphertext picture cannot be recognized.2) Prove that SMA and 3SMA two encryption algorithms have high sensitivity of the key and greater key space the existing digital image encryption algorithm based on Arnold transform, thus these two new algorithms have higher safety performance.3) Prove that 3SMA has a lower correlation between neighboring pixels compared to SMA algorithm and 3SMA algorithm can solve the problem that SMA can not change the image pixel grayscale.