Gravity of Real-Time Security Issue in Today’s Cloud Environment The security has always been the core issue of the information technology since the advent of the concept of e-commerce and electronic transactions. There are the hundreds of thousands of security related threats that our networks encounter daily. If we analyzed the so-called big data, we would be astonished that billions of security events take place in our network elements daily. In fact, there are more than one billion events recorded just in a single Firewall network element. Is existing network security capable of dealing with the information in real time?