HMAC Based authentication for VANETS combined with Visual cryptography

VANET is an emerging type of distributed network and it is dynamic in nature which provides variety of services such as detecting oncoming collision and provides warning signal to alert the driver. In military application data security is an imp issues. This paper presents a secured and an efficient way of sending data and image in encrypted form using HMAC based authentication and Visual Cryptography respectively. Hash based Message Authentication is provided to authenticate node and messa function MD-1,256,512 are used for message integrity and symmetric key mechanism is carried out in this work. To transmit image securely among the authenticated node ,visual cryptography technique is proposed in this paper. Encryption and decryp image is accomplished by using mathematical algorithm. Digital watermarking scheme with visual cryptography is proposed to secure the confidential image. Image is divided into two images using VCS, it is not possible to recover the original images accessing both the shares. The OR operator is used to superimpose the two images and fully recover the original template.