Dynamic Message Authentication Code for Short Messages

every field, many applications rely on the existence of small devices that can exchange information and form communication networks. Short messages are widely in use these days. So many applications rely on the existence of small devices for communication. Here the confidentiality and the integrity play a major role. So we propose two techniques. In the first technique we authenticate the message and encrypt it with a short random string. In the second technique the extra assumptions are made whether the algorithm used is a block cipher and also improve them. MACs provide integrity for messages. Without taking it as an advantage the message must be checked whether it is encrypted or not. The main goal is to utilize the security that the algorithm can provide to design more efficient authentication mechanism. Keywords—Tag generation; Authentication; Performance I