Cloud Server Aided Computation for ElGamal Elliptic Curve Cryptosystem

Cloud computing has become more popular, because users complete heavy computation with the help of cloud servers. However, users usually need to face some security problems during the process of cloud aided computation. The cloud server aided cryptosystems are used to help users to finish complex encryption/decryption computation, and users won´t worry about data leakage. Therefore, this paper proposes a new cloud server aided computation for ElGamal Elliptic Curve cryptosystem. In addition to providing related cloud services to users, the proposed protocols can prevent some active attacks and passive attacks, e.g. modification attack, guessing attack, etc.