  Tremendous and extraordinary growths in the field of internet, intranet,
extranet and its users have developed an innovative era of great global
competition and contention. Denial of service attack by multiple nodes is
accomplished of disturbing the services of rival servers. The attack can be for
multiple reasons. So it is a major threat for cloud environment. Due to low
effectiveness and large storage conventional defending approaches cannot be
easily applied in cloud security. The effects of various attacks can decrease
the influence of a cloud. So, in view of this challenge task, this paper aims
at enhancing a proposed method for cloud security. We propose a modification to
the confidence Based Filtering method (CBF) which is investigated for cloud
computing environment based on correlation pattern to mitigate DDoS attacks on
Cloud. The modification introduces nominal additional bandwidth and tries to
increase the processing speed of the victim initiated server.

Cryptography and Security