Secure and efficient transmission of data based on Caesar Cipher Algorithm for Sybil attack in IoT

Abstract The Internet of Things (IoT) is an emerging concept in the field information technology. IoT can integrate any real-time entity with another, using sensing, computing and communication capabilities to offer enhanced services everyday life. In this article, IoT-based patient health monitoring considered for use sensors deployed devices. These devices are attached body timely tracking his or her condition. During data transfers from connected patient’s doctor, may be susceptible security threats. subjected many routing attacks, like blackhole, greyhole, Sybil, sinkhole wormhole attacks. Sybil attacks most dangerous This type attack involves stealing identities legitimate nodes; this, turn, leads loss, misinterpretation network increase disturbances. Hence, paper, we propose traditional Caesar Cipher Algorithm (CCA) along lightweight encryption algorithm (LEA) Received Signal Strength Indicator (RSSI) detect prevent environment. proposed detects false node a particular path by announcing another node. It also prevents choosing alternative which forward packets desired users. To ensure authentication, privacy integrity, 64-bit key used AODV as protocol.