A New Encryption Cipher for Securing Digital Images of Video Surveillance Devices Using Diffie-Hellman-MD5 Algorithm and RGB Pixel Shuffling

In today´s cyberspace, there exists several security challenges associated with the processing and transmission of digital images over an open and unsecured network. There exists a high concern of insecurity due to malicious activities over these open networks. It is therefore necessary to assure the confidentiality, the integrity and the authenticity of the digital image transmission over these open and unsecured networks which modern day cryptography can provide. This paper proposed a new method for digital image encryption based on a hybrid encryption technique. The Diffie-HellMan key exchange algorithm was used to exchange keys between two parties. A secret shared key was generated from the private key of first party and the public key of the second party and then hashed using MD5 algorithm. The hashed message was used to encrypt mxn size of plain images by using the images´ array pixel values. This was achieved through pixel shuffling and displacement algorithm. Analysis was performed on the ciphered images to determine the efficiency of the algorithm. The algorithm was implemented using MATLAB. This new method can provide a high security solution to surveillance cameras, and other security devices that send video images over communication channels.