A New Hybrid Cryptography Technique in Wireless Sensor Network

Abstract

The wireless sensor network is a large number of tiny nodes installed in insecure environment for monitoring, gathering and transferring data and are prone to security threats for its limited resources. In order to transmit the data and to protect from different attacks in the network maintained. To achieve confidentiality, authenticity and authorization of data which secure the data from different attacks cryptographic algorithm were used. The number of keys used in the cryptographic algorithm determines the secu the data. Cryptographic algorithms are broadly classified into two types symmetric cryptography and asymmetric the symmetric key cryptographic algorithm, a secret key is in the network and in asymmetric key cryptographic two keys are used for data security. In wireless symmetric key cryptography required more storage to store the key among all the nodes of the network and cryptography more computation time is require encryption and decryption. To avoid memory and computation overhead we proposed a hybrid cryptosystem to handle the security in the wireless sensor network. Initially shared key is exchanged among nodes using ECC which is a public key algorithm. Data is encrypted and decrypted using RC4 symmetric key algorithm. Various performance measures such as time taken for encryption and decryption process and memory needed for storing cipher text data. The proposed model shows faster encryption of data and takes less memory for key s compared to the traditional approach.