Abstract: Message authentication is an effective mechanism, used to authenticate the messages in wireless sensor networks (WSNs). Wireless Sensor Network consists of a large number of sensor nodes. Each sensor node knows its location in the sensor domain and is capable of communicating with its neighboring nodes directly using geographic routing. Many message authentication schemes are based on either symmetric-key cryptosystems or public-key cryptosystems. An existing system like polynomial based scheme authenticate the message based on threshold value, this is a problem of existing system because only limited number messages are authenticated. Proposing a new Source Anonymous Message authentication (SAMA) is a scalable authentication scheme based on elliptic curve cryptography (ECC) is used to allow any node to transmit and authenticate an unlimited number of messages without suffering the threshold problem and provides message source privacy.

Keywords: Hop by hop message Authentication, elliptic curve cryptography, WSN, SAMA, MES.