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International Journal of Information Technology & Management Information System (IJITMIS), ISSN
INTERNATIONAL JOURNAL OF INFORMATION TECHNOLOGY &
0976 – 6405(Print), ISSN 0976 – 6413(Online) Volume 4, Issue 3, September - December (2013), © IAEME

MANAGEMENT INFORMATION SYSTEM (IJITMIS)

ISSN 0976 – 6405(Print)
ISSN 0976 – 6413(Online)
Volume 4, Issue 3, September - December (2013), pp. 01-11
© IAEME: http://www.iaeme.com/IJITMIS.asp
Journal Impact Factor (2013): 5.2372 (Calculated by GISI)
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IJITMIS
©IAEME

ATTACKS CLASSIFICATION IN NETWORK
1

Shwetambari Ramesh Patil,

2

Prof. S.B. Javheri

Department of Computer Engineering, Rajarshi Shahu College of Engineering,
University of Pune, Tathawade, Pune 411033. Maharashtra (India)

ABSTRACT
In Today's internet word the network security is main issue. The intruder can access
our data easily if they are not detected. Here we are introducing the Modified Apriory
Algorithm which detect attacks and classify them into its attack category and attack type.
Modified Apriory Algorithm use the ICMP_TCP.txt file for generation of rules. These rules
are given to snort and using snort in real time traffic we can detect and classify ICMP and
TCP attacks. Classification of attacks helps to take proper action against attack if it is
accurately classified.
Keywords: Artificial Neural Network, Intrusion Detection System, Multilayer Perceptron,
Network Security
1. INTRODUCTION
We have designed the intrusion detection and classification system based on the
Modified Apriory Algorithm. The system detect and classify attacks. This feature enables the
system to suggest proper actions against possible attacks.
Internet is a global public network. With the growth of the Internet and its potential,
there has been subsequent change in business model of organizations across the world. More
and more people are getting connected to the Internet every day to take advantage of the new
business model popularly known as e-Business. Internet work connectivity has therefore
become very critical aspect of today’s e-Business. There are two sides of business on the
Internet. On one side, the Internet brings in tremendous potential to business in terms of
reaching the end users. At the same time it also brings in lot of risk to the business. There are
both harmless and harmful users on the Internet. While an organization makes its information
system available to harmless Internet users, at the same time the information is available to
the malicious users as well. Malicious users or hackers can get access to organizations

1


internal systems in various reasons. These are: software bugs called vulnerabilities, lapse in
administration, leaving systems to default conﬁguration.
2. RELATED WORK
The timely and proper detection of computer and Network system intrusions has
always been an important for system administrators and information security researchers.
While the complexities of host computers already made intrusion detection a difficult
attempt, the increasing in spreading distributed network-based systems and insecure networks
such as the Internet has greatly increased the need for intrusion detection. Most current
approaches to the process of detecting Intrusions utilize some form of rule-based analysis.
Rule-based analysis sets of predefined rules that are provided by an administrator or created
by the system. Expert systems are the most common form of rule-based intrusion detection
approaches. The use of expert system techniques in intrusion Detection mechanisms were a
significant milestone in the development of effective and practical detection-based
information security systems. An expert system consists of a set of rules that encode the
knowledge of a human "expert". These rules are used by the system to make conclusions
About the security-related data from the intrusion detection system. Unfortunately, expert
systems require frequent updates to remain current. This design approach usually results in an
inflexible detection system that is unable to detect an attack if the sequence of events is even
slightly different from the predefined profile. While increasing the level of abstraction of the
rule-base does provide a partial solution to this weakness, it also reduces the granularity of
the intrusion detection device. The problem may arise that the intruder or hacker is an
intelligent and flexible agent while the rule-based IDSs obey fixed rules. In fact expert
systems suffer from the updating, the searching and the Matching of the rule sets.
An intrusion detection system (IDS) [3]is a device or software that observe the
network or system activities for malicious activities or policy violations and produces reports
to a Management Station. Some systems may attempt to stop an intrusion attempt but this is
neither required nor expected of a monitoring system. Intrusion detection and prevention
systems (IDPS)[4] are primarily focused on identifying possible incidents, logging
information about them, and reporting attempts. In addition, organizations use IDPSes for
other purposes, such as identifying problems with security policies, documenting existing
threats and deterring individuals from violating security policies. IDPSes have become a
necessary addition to the security infrastructure of nearly every organization.
2.1 Existing System
2.1.1 Anomaly based IDS
This is also known as Heuristic or Behaviour based, Anomaly based IDS analyzes the
traffic patterns and determine normal activities. After that, it applies statistical or heuristic
measures to event to determine if they match with this normal behaviour. Events which do
not match with the accepted normal behaviour patterns are considered as attacks [1][7]. By
creating patterns of normal behaviour, anomaly based IDS systems can observe when current
behaviour deviates statistically from the normal. This capability theoretically gives anomalybased IDSs abilities to detect new attacks that haven't been seen before or close variants to
previously known attacks. It means, these types of IDS may identify any possible attacks [8].
Since normal behaviour can be changed over time, this type of system requires
frequent retraining of the behaviour profile, lack of which results either in unavailability of
the intrusion detection system or in additional false alarms. This type of systems normally
2


provides comparatively high false alarms as something even slightly different from normal
behaviour is considered as an attack by this types of IDS. It also requires expertise to figure
out what triggered an alarm.
2.1.2 Host based IDS (HIDS)
Host Based IDS is installed locally on host machines[1]. It works on information
collected from within an individual computer system. It utilizes information sources like
operating system audit trails, C2 audit logs and system logs. HIDS can be installed on
different types of machines namely servers, workstations and notebook computers. Hostbased IDS can analyze activities on the host it monitors at a high level of detail. It can often
determine which processes and/or users are involved in malicious activities. It can monitor
events that are local to a host and can detect successful or failure of attacks that cannot be
seen by a network-based IDS. Host-based IDSs can use host-based encryption services to
examine encrypted traffic, data, storage and activity. They are unaffected by switched
networks and independent of network topology. They can provide thorough information
gathered via logs and audit; for example Kernel logs records that the user is.
2.1.3 Network based IDS (NIDS)
Network based IDS monitors the traffic on its entire network segment[3]. This is
generally accomplished by placing the network interface card in promiscuous mode to
capture all network traffic segments. These network traffic packets are checked network by
the IDS to find the attacks. Network based IDS can reassemble packets, look at headers,
determine if there are any predefined patterns or signature match. Depending on this pattern
or signature matching, IDS decides about the attacks. Network-based IDSs can monitor an
entire, large network with only a few well-situated nodes or devices and impose little
overhead on a network. This type of IDSs is mostly passive devices that monitor ongoing
network activity without adding signature overhead or interfering with network operation.
They can monitor network for malicious activity on known ports such as http port 80. They
are easy to secure against attack and may even be undetectable to attackers; they also require
little effort to install and use on existing networks. Furthermore, they are operating systems
independents.
2.1.4 MLP Algorithm
A multilayer perception (MLP)[1][2] is a feed forward artificial neural network model
that maps sets of input data onto a set of appropriate output. An MLP consists of multiple
layers of nodes in a directed graph, with each layer fully connected to the next one. Except
for the input nodes, each node is a neuron (or processing element) with a nonlinear activation
function. MLP utilizes a supervised learning technique called back propagation for training
the network. MLP is a modification of the standard linear perceptron and can distinguish data
that is not linearly separable. MLP algorithm is used to detect and classify attacks from KDD
cup file. It classify attacks such as smurf, teardrop , etc.
3. PROBLEM STATEMENT
The timely and proper detection of computer and Network system intrusions has
always been an important for system administrators and information security researchers.
While the complexities of host computers already made intrusion detection a difficult
attempt, the increasing in spreading distributed network-based systems and insecure networks
3


such as the Internet has greatly increased the need for intrusion detection. Most current
approaches to the process of detecting . Expert systems are the most common form of rulebased intrusion detection approaches. The use of expert system techniques in intrusion
Detection mechanisms were a significant milestone in the development of effective and
practical detection-based information security systems. An expert system consists of a set of
rules that encode the knowledge of a human "expert". The problem may arise that the
intruder or hacker is an intelligent and flexible agent. In fact expert systems suffer from the
updating, the searching and the Matching of the rule sets.
The proposed system use Modified Apriory Algorithm to detect ICMP and TCP
attacks and classify attack into attack category and attack type.
3.1 Goals and objectives
1. Protection against malicious tampering.
2. Interoperability with other network management and security tools.
3. To develop a solution with high detection rate and negligible false alarm.
4. We propose to use several diﬀerent techniques of anomaly detection to achieve this goal.
3.2 Statement of scope
In this system we are implementing Modified Apriory algorithm and system works
within LAN. This project can be useful to students, staff, office employees etc.
Implementation of Modified Apriory Algorithm and attack classification is done. We are
using ICMP_TCP.txt file in which signature of all TCP and ICMP attack is stored. This
dataset is used as the input file for performing classification and generation of rule file.
•
We use ICMP_TCP.txt file for calculating the output count in first phase.
•
In second phase Modified Apriory Algorithm generate rules from TCP_ICMP.txt to
detect and classify attack of TCP and ICMP.
•
Modified Apriory algorithm and rules creation enables to perform the real-time
operations. The server generates alarm, when attacks sent from the client are detected.
The server then kills the process and shutdown client machine.
4. MODIFIED APRIORY ALGORITHM
By the observation of the attack signatures, we find that there are some attack
signatures dependent on other previous attack signatures. This is due to the new attack is a
derivative from the previous attack. So far as we know, there are at least two kinds of attacks
have this property. For the first case, a new attack is variation of an existing attack. The steps
of how to find out frequent k-item sets will be as follow. At the first step, all of the frequent
items will be found. And then we use a simple way to scan the database in order to find the
frequency of occurrence of each item, and decide which one meets the minimum support.
Secondly, we generate the candidate n-item sets by checking all of the possible combinations
of the frequent items with already known signatures, if they meet the minimum support
requirement. Then, append this n item sets from right. We can first append the backward,
until the minimum support is unsatisfied. Then, we append forward, and stop when the same
condition occurred. Finally, the maximum length of frequent-item set can be mined by our
method. When the minimum support decreases, the processing times of algorithms increase
because of the total number of candidate item sets increases. Our algorithm is faster than the
Signature Apriory no matter what the minimum support is. The reason is that the number of
candidate 1-itemsets is not very large. Therefore, in the real environment, there are not too
4


much candidate item sets to be generated during each pass of finding signatures. One of the
approaches of developing a network safety is to describe network behaviour structure that
point out offensive use of the network and also look for the occurrence of those patterns.
While such an approach may be accomplished of detecting different types of known intrusive
actions, it would allow new or undocumented types of attacks to go invisible. As a result, this
leads to a system which monitors and learns normal network behaviour and then detects
deviations from the normal network behaviour.
Association Rules find all sets of items (itemsets) that have support greater than the
minimum support and then using the large item sets to generate the desired rules that
have confidence greater than the minimum confidence.
4.1 RELEVANT MATHEMATICS
•
Steps find_frequent_n-itemsets
Input: D, min_sup, L1, known _signature.
Output: Ln
Algorithm:
Step 1: Ln =Φ ;
Step 2: for each item in L1 do
Step 3: add known_signature + item into Cn
Step 4: Ln ={c∈Cn | support ( c )≥min_sup;
•
Algorithm candidates_gen
Input: D, min_sup, L1
Output: L k
Algorithm:
Step 1: L k = Φ ;
Step 2: for each item in L 1 do begin
Step 3: add sig+ item into C k
Step 4: Lk={c∈Ck|support (c) ≥ min_sup};
Step5: if there is no any s(sig+ item) ≥min_sup
then do step 6,7 until find maximum length of frequent itemset.
Step 6: add item+ sig into C k
Step 7:Lk ={c∈Ck|support (c) ≥ min_sup};
Step 8: if there is no any s(item+sig)>=min_sup.Then stop this procedure.
•
Proposed Algorithm
Input: D, min _sup.
Output: Lk
Algorithm:
Step 1: L1= find_frequent_1_itemsets(D, min_sup);
Step 2: Ln= find_frequent_n_itemsets(D, L1, min_sup,known_signature);
Step 3: for k=n+ 1 to max_len do
Step 4: Ck= candidates_gen (D,L1,Lk-1, min_sup);
Step 5:Answer=Lk
5


•
Steps find_frequent_n-itemsets
Input: D, min_sup, L1, known _signature.
Output: Ln
Algorithm:
Step 1: Ln =Φ ;
Step 2: for each item in L1 do
Step 3: add known_signature + item into Cn
Step 4: Ln ={c∈Cn | support ( c )≥min_sup;
•
Algorithm candidates_gen
Input: D, min_sup, L1
Output: Lk
Algorithm:
Step 1: Lk = Φ ;
Step 2: for each item in L 1 do begin
Step 3: add sig+ item into Ck
Step 4: Lk={c∈Ck|support (c) ≥ min_sup};
Step5: if there is no any s(sig+ item) ≥min_sup
then do step 6,7 until find maximum length of frequent itemset.
Step 6: add item+ sig into Ck
Step 7:Lk ={c∈Ck|support (c) ≥ min_sup};
Step 8: if there is no any s(item+sig)>=min_sup.Then stop this procedure.
4.2 ARCHITECTURAL DESIGN
This represent the early stage of the software design process. Here a description of the
program architecture is presented.

Fig.4.1 Sytem Diagram

6


Fig.4.1 shows the architecture diagram. There are several modules that introduce the
network intrusion detection system based on the Apriory algorithm. Now we are about to
describe this layering structure step by step. The Modified Apriory Algorithm contains
following steps:
• On server side Modified Apriory Algorithm is chosen. we find that there are some attack
signatures dependent on other previous attack signatures. This is because of the new
attack is a derivative from the previous attack.
• Modified Apriory Algorithm is use to classify attacks from ICMP_TCP.txt file.
• The input _count and output_count for ICMP_TCP.txt file is calculated. This gives the
accuracy of attack classification.
• By using Modified Apriory Algorithm the Candidate set is generated. Then scan
reduction technique is used.
• Using candidate set rules are generated in Modified Apriory algorithm. These rules are
created using the combination of attacks which are stored in ICMP_TCP.txt file. These
rules are stored in rules file.
• Rule file is given input to the snort here the real traffic is given to snort and using rule
file it detect the TCP and ICMP attack and gives accuracy of detection and detection rate.
It also detect the attack category and attack type.
4.3 DATA DESIGN
The system does not involve any use of database or entity tables. The data storage
require is done in flat comma separated files.
4.3.1 Internal software data structure:
1. For modified Apriory algorithm we use ICMP and TCP packet and create rule file
ICMP_TCP File in txt format
4.3.2 Database description
Modified Apriory Algorithm classify attacks of TCP and ICMP from TCP_ICMP.txt
file. Modified Apriory Algorithm is also used for real time attack detection. Here the system
detect the ICMP and TCP packet and attack using the rule file which is created using
Modified Apriory Algorithm.
5. RESULT
In system we design Modified Apriory Algorithm. we compare the processing time
of the proposed algorithm with or without the scan-reduction. It is clear that the processing
time of the proposed algorithm with scan-reduction method rise sharply when minimum
support is smaller than 0.4. The reason is that smaller minimum support causes very large
candidates be generated after three passes. Therefore, we can know that the proposed
algorithm with scan reduction method is good for the high minimum support.
Here, we use two different spans as for test. The result shows that by using longer
string as signature for SNORT will get more accuracy than shorter string. Analysis show that
the detection rate of the shorter span curve is higher than longer span curve. The reason is
that the probability of a shorter signature in normal traffic (not attack) is high, and this will
cause the high false positive rate.

7


Table.5.1 Classification rate-ICMP
Table.5.1 shows the Classification rate of ICMP attack type from ICMP_TCP.txt file.
It uses the Modified Apriory algorithm for attack classification. ICMP_TCP .txt file contains
all ICMP attack. The algorithm classifies the ICMP attack into shows the attack type and
classification of attack type.

Table.5.2 Classification rate-TCP
8


Table.5.2 shows the classification rate for TCP attack. Table.5.2 shows the table of
classification rate for TCP packet.

Table.5.3 Classification rate-realtime
Table.11.3 shows the classification rate for real time traffic. Table.11.3 show the
classification rate for real time traffic containing TCP and ICMP attack.

Fig.5.4 Detection rate-realtime
Fig 11.1 shows the graph of detection of attack in real time traffic using Modified
Apriory Algorithm. The algorithm detect attacks using rule file which is given to snort.
9


6. FUTURE ENHANCEMENT
•
•

Future work can be done by using the experimental setup and by using different
number of nodes and with different traffic conditions.
Real time implementation of the system for detecting more types of attack not only
ICMP and TCP attacks

7. CONCLUSIONS
The project "Classification of Attacks In Intrusion Detection System" describes how
we can classify TCP and ICMP attacks in real time traffic. The system use the Modified
Apriory Algorithm which is a modified version of Signature Apriory Algorithm. Modified
Apriory Algorithm generate rule file from ICMP_TCP.txt file. The rule file is given to snort
for real time attack detection and classification. Here attack type and category is detected
which is helpful for taking proper action against proper attack category and attack type.
8. REFERENCES
[1]

[2]

[3]

[4]
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[7]

[8]

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