Image Encryption and Decryption uses Advanced Encryption Standard (AES) algorithm fo encrypting and decrypting the grayscale images. The system uses AES-128 block. The block size and key length is both 128 bit. It follow 10 rounds where 9 rounds are same and last round is different. The rounds perform four steps: Sub bytes, Shift Row, Mix Column, Add round Key. First the image pixels are converted into bytes and they are processed by four steps. AES algorithm was successfully implemented to encrypt and decrypt the grey scale image