The existence of small gadget that can used to  exchange message and form conversation networks. we propose two peculiar techniques for authenticating short encrypted messages that are directed to meet the concern of mobile and Ubiquitous applications. In a symbolic portion of such utilization, the familiarity and purity of the communicated messages are of precise interest.  In this work, we propose two novel techniques for authenticating short encrypted messages that are directed to meet the requirements of mobile and pervasive applications. By taking advantage of the fact that the message to be authenticated must also be encrypted, we propose provably secure authentication codes that are more efficient than any message authentication code in the literature.