Secure and efficient bi-directional proxy re-encyrption technique

Rapid development of communications over internet such as online money transaction, transaction of E-mail with sensitive data (medical data) and so on has led to need for strong cryptographic technique. There has been continuous research going on to assure strong security by various cryptanalyst. However, performance, computation time and ease of use play a significant role in using the algorithm for implementation. Proxy re-encryption plays a significant role in protecting data that are stored in public environment (cloud). Many existing Proxy re-encryption technique induces high computation overhead due to adoption of public key cryptography such RSA (Rivet Shamir Adleman), ECC (Elliptical Curve Cryptography) etc. To address this work present a Bidirectional Proxy Re-encryption scheme by adopting lattice based cryptography technique. Experiment is conducted for computation overhead by varying key and data size which attained significant performance improvement over existing Proxy Re-encryption scheme.