High performance multi-image encryption based on temporal-spatial double random ghost coding

A high performance multi-image encryption method is presented by using the temporal-spatial double random ghost coding (TSDRGC). As an original idea in optical encryption, TSDRGC employs the chaotic lasers as light sources instead of conventional lasers. The random fluctuations of the chaotic laser can be seen as the new temporal security keys introduced into the cryptosystem, except the random illumination patterns used usually in the conventional ghost imaging as a set of spatial security keys. In the encryption process, all the images can be optically encoded in parallel and the time consumed by the encryption process does not increase compared to encrypting an image alone. Meanwhile, a decryption algorithm is proposed to achieve high quality decryption of each image independently while reducing the bit-width requirement. The simulations demonstrate the excellent performance of the scheme in terms of security, capability and robustness.