An Encryption-then-Compression Scheme Using Autoencoder Based Image Compression for Color Images

The goal of this work is to develop an encryption and then compression scheme for the efficient transmission of color images over an untrusted channel. An image encryption scheme based on bidirectional diffusion is used to encrypt the 8-bit RGB color image. Then, lossless, autocoder-based compression of the encrypted image is performed to achieve compression. The compression method is used to reduce the size of the images during transmission, thus speeding up the transmission. The performance of the compression algorithm is evaluated in terms of the compression ratio.