A Hybrid Addition Chaining Based Light Weight Security Mechanism for Enhancing Quality of Service in IoT

IoT in Wireless Sensor Networkis a network of physical objects connected to internet such as RFID and sensors. As these types of objects have limited computation power and memory, execution of public key cryptography would be a daunting task. So a light weight encryption with Elliptic Curve Cryptography (ECC) is proposed in this work. A major issue in ECC is its computational cost as it is complicated to compute the scalar multiplication. To address this issue, a novel method called graph based addition chaining (GBAC) is proposed. This graph technique produces all possible optimum addition chains for the given integer n by utilizing edge weight of all possible numbers created from each number of addition chain. This addition chain technique can be used in modular exponentiation which is an essential step in the implementation of public cryptographic algorithms like ElGamal, RSA, etc., so that the time for encryption and decryption for these algorithms can be reduced drastically. The proposed GBAC technique has used addition chaining technique instead of scalar multiplication in ECC which greatly reduces the computation time as well as computation cost. It also reduces the complexity in ECC. Numerous experiments has been made and proved that our work decreases the decryption time by at least 10% than RSA algorithm, reduces computation cost and improves the performance of parameters like CPU time, Memory requirement and key preparation time and better than RSA in decryption.