Deepti Sharma PGFB1113 Harshita Sinha PGFB1118 Himanshu Yadav PGFB1119 Saurabh Srivastava PGFB1141 Shreya PGFB1144 Sumit Agarwal PGFB1151

What is NETWORK security? Why do we need security? Hacker Vs Cracker Main Objectives & Threats Common security attacks and

countermeasuresFirewalls Intrusion Detection Systems

Conclusions & Learning Experiences.

The area of network security consists ofthe provisions and policies adopted by thenetwork administrator to prevent andmonitor unauthorized access, misuse,modification, or denial of the computernetwork and network-accessible resources.Network security involves the authorizationof access to data in a network, which iscontrolled by the network administrator.

Security is one of the most critical aspects of any network.

A computer network is only as strong as its weakest link.

Computer security has become more important than ever.

The security community distinguishes between a “hacker”, someone who (nonmaliciously) programs,manages or uses computing systems, and a “cracker”, someone who attempts access to computing systems for malicious purposes.

CONFIDENTIALITY

INTEGRITY

AVAILABILITY

LEGITIMATE USE

INFORMATION LEAKAGE

INTEGRITY VIOLATION

DENIAL OF SERVICE

ILLEGITIMATE USE

FIREWALLS

INTRUSION DETECTION SYSTEM

A firewall is a device or set of devicesdesigned to permit or deny networktransmissions based upon a set of rules and

isfrequently used to protect networks fromunauthorized access while permittinglegitimate communications to pass.

It filters all traffic between protected networkand a less trustworthy network.

l

PACKET FILTER The system examines each packet

entering or leaving the network and accepts or rejects it based on user defined rules.

PROXY SERVER It intercepts all messages entering

and leaving the network.

An intrusion detection system (IDS) is a device or software application that monitors network and/or system activities for malicious activities or policy violations and produces reports to a Management Station.

IDPSs typically record information related to observed events, notify security administrators of important observed events, and produce reports.

Ex. Burglar and car alarms are forms of IDS

Monitoring users and system activity. Recognizing known attack patterns in

system activity. Identifying abnormal activity through

statistical analysis. Installing and operating traps to record

information about intruders.

CONCLUSIONS

&LEARNING

EXPERIENCES

http://www.robertgraham.com/pubs/network-intrusion-detection.html

http://online.securityfocus.com/infocus/1527

http://www.snort.org/ http://www.cert.org/ http://www.nmap.org/ http://grc .com/dos/grcdos.htm http://lcam tuf.coredump.cx/

newtcp/

THANK YOU

Do You have Any

Questions…