Application security encompasses measures taken throughout the application's life-cycle to prevent exceptions in the security policy of an application or the underlying system (vulnerabilities) through flaws in the design, development, deployment, upgrade, or maintenance of the application.


Intrusion Prevention Systems (IPS), also known as Intrusion Detection and Prevention Systems (IDPS), are network security appliances that monitor network and/or system activities for malicious activity.

Today web sites are the most vulnerable, and therefore the most hacked. Snort a free and open source Network Intrusion Detection/Prevention System is the best tool for managing and preventing intrusions to your applications, and Internet-enabled programs or web sites, Snort can not only protect your sites, but it can analyze what's really going on with your networks.

widely used open source Snort® which is an open source IDS/IPS developed by Sourcefire.The main functions of "intrusion prevention systems" are to identify malicious activity, log information about said activity, attempt to block/stop activity, and report activity.

Intrusion prevention systems are considered extensions of intrusion detection systems because they both monitor network traffic and/or system activities for malicious activity. The main differences are, unlike intrusion detection systems, intrusion prevention systems are placed in-line and are able to actively prevent/block intrusions that are detected.

Intrusion Prevention Systems can be classified into four different types:

1).Network-based Intrusion Prevention (NIPS): monitors the entire network for suspicious traffic by analyzing protocol activity.

2).Wireless Intrusion Prevention Systems (WIPS): monitors a wireless network for suspicious traffic by analyzing wireless networking protocols.

3).Network Behavior Analysis (NBA): examines network traffic to identify threats that generate unusual traffic flows, such as distributed denial of service (DdoS) attacks, certain forms of malware, and policy violations.

4).Host-based Intrusion Prevention (HIPS): an installed software package which monitors a single host for suspicious activity by analysing events occurring within that host.

Detection Methods

The majority of intrusion prevention systems utilize one of three detection methods: signature-based, statistical anomaly-based, and stateful protocol analysis