  Software Defined Networking (SDN) is a network paradigm shift that
facilitates comprehensive network programmability to cope with emerging new
technologies such as cloud computing and big data. SDN facilitates simplified
and centralized network management enabling it to operate in dynamic scenarios.
Further, SDN uses the OpenFlow protocol for communication between the
controller and its switches. The OpenFlow creates vulnerabilities for network
attacks especially Distributed Denial of Service (DDoS). DDoS attacks are
launched from the compromised hosts connected to the SDN switches. In this
paper, we introduce a time- and space-efficient solution for the identification
of these compromised hosts. Our solution consumes less computational resources
and space and does not require any special equipment.
