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Network System for Secure Communication

Info: 5385 words (22 pages) Dissertation
Published: 12th Dec 2019

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Tagged: Information TechnologyComputing


The main methodology involved behind this research project is to provide the importance of such technology from professionals and well referred articles. Some of the general interviews will be added to the project with details showing their interest towards the current technology and also the change they see in communicating with the new technology.

It on the hands of the components of IP Security that contribute to this level of secure communication:

  • The IP Security (IPSec) Driver is used to monitor, filter, and secures the traffic throughout the system.
  • The (ISAKMP/Oakley) abbreviated as Internet Security Association Key Management Protocol performs key exchange and management functions that oversee security issues between hosts, and provide keys which can be used with security algorithms.
  • The IP Security Policy and the Security Associations are derived from those policies that define the security environment where two hosts can communicate.
  • The function of Security Association API is to provide the interface between the IPSec driver, the Policy Agent and the ISAKMP.
  • The function of the management tools is to create policies, monitor IP Security statistics, and log IP Security events.
  • The main methodologies which are under consideration for this project are Classical encryption technologies, IP sec Tunnel, IP sec VPN, Internet Key Exchange methods, Block Cipher & Data Encryption, Advanced Encryption, Symmetric ciphers, Public & private key functions, Digital signature etc, which have suggested me to design a better system.


The main reason behind selecting IPSec is that it so powerful that it provides security to IP layer, and also forms the basis for all the other TCP/IP protocols. This is generally composed of two protocols:

Authentication Header (AH);

Encapsulating Security Payload (ESP);

IPSec Implementation Methods:

IPSec is comprised of several implementations architectures which are defined in RFC 2401. The IPSec implementation also depends on various factors including the version of IP used (v4 versus v6), the basic requirements of the application and other factors.

End Host Implementation:

Implementing IPSec in all host devices provides the most flexibility and security. It enables “end-to-end” security between any two devices on the network.

Router Implementation:

Router implementation however is a much simpler task since we only make changes to a few routers instead of hundreds or thousands of clients. It only provides protection between pairs of routers that implement IPSec, but this may be sufficient for certain applications such as virtual private networks (VPNs).

The idea will be implemented after proper testing of various available methodologies. The current strategy for implementation is as follows:. We use certain open – source softwares which provide encryption and decryption methods and authentication. In the actual system, the user is asked to enter details of files to be sent and also some other details about the password and the public keys if included. The required software are used in a way which helps to run a smooth process and secure operation.



I owe many thanks to people who helped & supported me in doing my dissertation.

Firstly, I would like to express my immense gratitude to my respected professor Mr. Dr. XXX, YYYY University, London for his support and motivation that has helped me to come up with this project.

He supported me when it’s needed and suggested me in understanding various methodologies in my project. He also took care of my project with attention to achieve my goal.

I thank to my Institution and faculty members for giving me an opportunity to do my dissertation and also for library, computer lab facilities for doing my dissertation to achieve practical results which can resolve my project related issues.

I also extend my Heart full thanks to my family & friends.

I owe my special thanks to my Dad and his colleagues who gave me suggestions on doing my Dissertation.


In the present system the network helps a particular organization to share the data by using external devices. The external devices are used to carry the data. The existing system cannot provide security, which allows an unauthorized user to access the secret files. It also cannot share a single costly printer. Many interrupts may occur within the system. Though it is advantageous we have numerous disadvantageous, somebody writes a program and can make the costly printer to misprint the data. Similarly some unauthorized user may get access over the network and may perform any illegal functions like deleting some of the sensitive information

Security is the term that comes into picture when some important or sensitive information must be protected from an unauthorized access. Hence there must be some way to protect the data from them and even if he hacks the information because he should not be able to understand what’s the actual information in the file, which is the main intention of the project. The project is designed to protect the sensitive information while it is in transaction in the network. There are many chances that an unauthorized person can have an access over the network in some way and can access this sensitive information. My main topic focuses on


(Internet Protocol Security) is an extension to the IP protocol specified by


which provides security to the IP and the upper-layer protocols and cryptography in a network sharing system. It was first developed for the new IPv6 standard and then “back ported” to IPv4. The IPSec architecture is described in the


uses two different protocols – AH (Authentication Header) and ESP (Encapsulating security payload) – to ensure the authentication, integrity and confidentiality of the communication. It uses strong cryptography to provide both authentication and encryption services. Authentication ensures that packets are from the right sender and have not been altered in transit. Encryption prevents unauthorised reading of packet contents. [2]

Cryptography is the technique used to secure the data while they are in transactions. Encryption and Decryption are two techniques used under cryptography technology. Data cryptography is the art of securing the resource that is shared among the applications. The main idea behind the design is to provide a secured communication between the networks showing network level performance practically by differentiating different operating system which can ensure the security, authenticity by considering, analyzing and testing any best available methodologies.

1. Introduction:

Businesses today are focused on the importance of securing customer and business data. Increasing regulatory requirements are driving need for security of data.

There have been many methods which have evolved over the years to address the need for security. Many of the methods are focused at the higher layers of the OSI protocol stack, thus compensating the IP’s lack in resolving security issues. These solutions can be implemented in certain situations, but they cannot be generalized because they are particularly too many applications. For example, Secure Sockets Layer (SSL) can be used for certain applications like World Wide Web access or FTP, but there are many other applications which cannot be resolved with this type of security.

A solution is required to allow security at the IP level was very necessary so that all higher-layer protocols in TCP/IP could take advantage of it. When the decision was made to develop a new version of IP (IPv6), this was the golden opportunity to resolve not just the addressing problems in the older IPv4, but also resolve lack of security issues as well. Later a new security technology was developed with IPv6 in mind, but since IPv6 has taken long time to develop, and thus a solution was designed to be usable for both IPv4 and IPv6.

The technology which brings a secure communications to the Internet Protocol is known as IP Security, commonly abbreviated as IPSec.


services allow users to build secure tunnels through certain networks. All the data that passes through the entrusted net is encrypted by the


gateway machine and decrypted by the gateway at the other end. The result obtained is a Virtual Private Network or VPN. This network is effectively private even though it includes machines at several different sites which are connected by the insecure Internet.

Cryptography technique is used to secure the data while they are in transactions. Encryption and Decryption are two techniques which are used under cryptography technology. Data cryptography is the art of securing the resource that is shared among the applications.

The Encryption and Decryption are termed as two powerful security technologies that are widely implemented to protect the data from loss and deliberate compromise. In this project the networking allows the company to share files or data without using certain external devices. Some unauthorized users may get access over the network and perform some illegal functions in certain cases like deleting files while the transaction is still on at that time encryption and then decryption techniques are implemented to secure the data. Many other attacks in cryptography are considered which lead me to research on different types of IPSec implementation methodologies in order to design the best model such that it may be suitable for the present trend of networking systems also form a platform to enable communication to the outside world. Thus in orders to implement IPSec, certain modifications are required to the system’s communications routines and certain new systems processes conduct secret key negotiations.

What is IPSec?

An extension to the IP protocol is considered as IPSec which provides high level security to the IP and to the upper-layer protocols. This was initially developed for the new IPv6 standard and then was back ported to IPv4. IPSec provides the following security services: data origin authentication, connectionless integrity, replay protection, data confidentiality, limited traffic flow confidentiality, and key negotiation and management. It has been made mandatory by the IETF for the use of IPSec wherever feasible; the standards documents are close to completion, and there are numerous implementations.

Overview of IPSec Architecture:

The IPSec suite defined as a framework of open standards. The following protocols are used by IPSec to perform various functions. [2][3]


provides three main facilities which are explained below:

Internet key exchange(IKE and IKEv2)

: This is used to set up a security association (SA) which can be done by handling negotiation of protocols and algorithms and generating the encryption and authentication keys which can be used by IPSec.[4][5]

Authentication Header (AH):

This is used to provide connectionless integrity and data origin authentication for IP datagram’s and also provides protection against replay attacks.[6][7]

Encapsulating Security Payload (ESP):

This is used to provide confidentiality, data origin authentication, connectionless integrity, anti-replay service, and limited traffic flow confidentiality. [9]

Both authentication and encryption are generally desired in this mechanism.

  1. Assure that unauthorized users do not penetrate the virtual private network
  2. Assure that eavesdroppers on the Internet cannot read messages sent over the virtual private network.

Since both the above features are generally desirable, most implementations are likely to use ESP rather than AH.

Security Association:

  • The security Association mechanism is used for authentication (AH) and confidentiality (ESP)
  • A one way relationship between a sender and a receiver that affords security services to the traffic carried on it.
  • Security services are afforded to an SA for the use of AH or ESP but not both.

SA identified by three parameters:

  • Security Parameter Index (SPI)
  • IP destination address
  • Security protocol identifier

Overview of IPSec Services and Functions:

IPSec is not only assumed as a single protocol, but is rather considered as a set of services and protocols which provide a complete security solution to the IP network. These services and protocols are combined to provide various types of protection. Since IPSec usually works at the IP layer, it provides protection for any higher layer TCP/IP application or protocol without using any additional security methods, which is considered as a major strength for its implementation. General types of protection services offered by IPSec include:

  • Encryption of user data to achieve privacy.
  • Authentication and message integrity has to be achieved to ensure that it is not changed on route.
  • Protection against certain types of security attacks, such as replay attacks.
  • The ability of the devices to negotiate the security algorithms and keys required in order to meet their security needs.
  • wo security modes called tunnel and transport are implemented to meet the various network needs.

Features & Benefits:

  • IPSec is observed to be transparent by the end users.
  • The users on the security mechanisms need not be trained.
  • IPSec assures security measures for individuals.
  • There is no requirement to change the software on a user or a server system.
  • Strong security measures are applied to the entire traffic crossing the perimeter.

2. Objective:

IPSec is mostly designed in order to encrypt the data between the two systems without any spoofing attacks. It is a key force of defence against internal and external attacks. However, other than these, there are many other security strategies which have prevented the security attacks. The main idea in my research is to provide a better approach to the implementation of IP Security by analyzing the present methodologies. In the implementation of this design, I am also considering different operating systems to provide a better approach towards security which can prove to be good in ideal ways. The design of such an approach is helpful in restricting any unauthorised access to the network and also helps in providing a secure and authenticated access.

The main idea behind the design is to provide a secured communication between the networks independent of the operating system which can ensure the security, authenticity by considering, analyzing and testing any two best available methodologies.

In my overview of RFC’s available in the Internet such as Cryptography the receiver end of a particular communication channel is not aware of the sender unless the sender transmits some information with private and public keys with cipher text which can prove his authenticity. Now the receiver sends the same package with his signature and then the receiver is also authenticated mutually.

Attacks may occur in different ways. There are also many ways where in such communications can be detected and using techniques like eavesdropping or sniffing or man in the middle attack. These are the three major problems for secure communications. In my research, I will attempt to design a procedure which can be easily followed in order to overcome such problems.

There are many techniques available now which are better than normal communication. The major problem in such techniques is the implementation of man in the middle attack. There have been many advances to try and rectify the problems but there has always been a flaw in the design. My research is to design a system using the current technologies used to encrypt and authenticate. These techniques play a major role in the implementation of IP Security.

The major interest would be in areas like encryption, decryption and authentication. Additions will be done to this research as it is implemented. The goal is to use research existing systems and to suggest a system which makes it even hard to break. It is not 100% immune to attacks but the attack may take longer to break the system than the present rate. This system will also be very safe and will be easy to use in daily life rather than something with a dozen processing steps to be followed.


With the rapid development of Multimedia data management technologies over the internet there is need to concern about the internet there is need to concern about the security and privacy of information. In multimedia document, dissipation and sharing of data is becoming a common practice for internet based application and enterprises.

As the internet forms the open source the present for all users’ security

Form’s the critical issue. Hence the transfer of information over the internet forms the critical issue. At the present situations the cryptographic techniques are used for providing ‘SECURITY’.


The project “Network system for Secure Communication” is totally enhanced with the features that enable us to feel the real-time environment.

Today’s world is mostly employing the latest networking techniques instead of using stand-alone PC’s. IPSec tunnelling or Encryption, information scrambling technology is an important security tool. By properly applying, it can provide a secure communication channel even when the underlying system and network infrastructure is not secure. This is particularly important when data passes through the shared systems or network segments where multiple people may have access to the information. In these situations, sensitive data and especially passwords should be encrypted in order to protect it from unintended disclosure or modification.


In this system ‘security’ is the term that comes into picture when some important or sensitive information must be protected from an unauthorized access. Hence there must be some way to protect the data from them and even if he hacks the information,

  • The proposed system provides the ‘security’ and it does not allow unauthorized users to access the secret files.
  • As per the ISO standards the security parameters are:
  • Confidentiality
  • Authentication
  • Integrity
  • Key distribution
  • Access control


Confidentiality is the protection of transmitted data from passive attacks. It can protect the data from unauthorized disclosure.


A process used to verify the integrity of the transmitted data, especially a message. It is the process of proving one’s identity to someone else.


The sender and the receiver want to ensure that the content of their communication is not altered during transmission.


Key distribution can be defined as a term that refers to means of delivering a key to the communicating parties, without allowing others to see the key.


It is a ability to limit and control the access to host systems and applications via communication links.

3.Literature Review

This project emphasis design and evaluates a computer-based system using appropriate process and tools. Most of the industry wide routers in the network implement their functionality in hardware and therefore we believe that hardware based routers are more efficient than a software-based router implementation besides that most of the work is in the research community which will be performed, using software-based routers utilizing off-the-shelf PCs. Various works have to be attempted which evaluates different protocol stack, however none of them use hardware-based routers, has such a wide range of metrics, and none investigated mechanisms.

My research methodology emphasis surveys, forums from the internet and articles from IEEE (Institute of Electrical and Electronics EngineersorIEEE) a quantitative approach in advance technology. I also consider various other thesis and books which are best suitable for my project.

Here following are the network related definitions, and few protocols from application layer, network and internet layer also discussed which actually gives clear idea of understanding the concepts.

3.1 IPSec Standards:

IPSec is actually a collection of techniques and protocols; it is not defined in a single Internet standard. Instead, a collection of RFCs defines the architecture, services and specific protocols used in IPSec. Some of the most important of these are shown below:

[RFC 2401] Security Architecture for the Internet Protocol

(IPSec overview)

The main IPSec document describes the architecture and general operation of the technology, and showing how the different components fit together.

[RFC 2402] IP Authentication Header

It defines the IPSec Authentication Header (AH) protocol used for ensuring data integrity and origin verification.

[RFC 2403] The Use of HMAC-MD5-96 within ESP and AH

Describes a particular encryption algorithm for use by AH and ESP called Message Digest 5 (MD5), HMAC variant.

[RFC 2404] The Use of HMAC-SHA-1-96 within ESP and AH

Describes a particular encryption algorithm for use by AH and ESP called Secure Hash Algorithm 1 (SHA-1), HMAC variant.

[RFC 2406] IP Encapsulating and Security payload (ESP)

It describes the IPSec Encapsulation Security Payload (ESP) protocol that provides data encryption for confidentiality.

[RFC 2408] Internet Security Association and Key Management Protocol (ISAKMP)

It defines methods for exchanging keys and negotiating security associations.

[RFC 2409] The Internet Key Exchange (IKE)

Describes the Internet Key Exchange (IKE) protocol used to negotiate security associations and exchange keys between devices for secure communications. It is based on ISAKMP and OAKLEY.

[RFC 2412] The OAKLEY Key Determination Protocol

It describes a generic protocol for key exchange.

[RFC 2131] Dynamic Host Configuration Protocol (DHCP) –

DHCP allows a host to obtain an IP address automatically, as well as to learn additional information about subnet mask, the address of its first-hop router, and the address of its local DNS server.

[RFC 2131; RFC 3022] Network Address Translation (NAT)-

In an attempt to provide transparent routing to hosts, NAT devices are used to connect an isolated address realm with private unregistered addresses to an external realm with globally unique registered addresses.

Domain Name System (DNS): It is a hierarchical naming system for computers, services, or any resource connected to the Internet or a private network. It associates various other information with domain names assigned to each of the participants. Most importantly, it translates domain names meaningful to humans into the numerical (binary) identifiers associated with networking equipment for the purpose of locating and addressing these devices worldwide. For example, www.example.com translates to

Windows Internet Name Service (WINS): It is Microsoft’s implementation of NetBIOS Name Service (NBNS), a name server and service for NetBIOS computer names. Effectively WINS is to NetBIOS names, like DNS is to domain names in fact it’s a central mapping of host names to network addresses. Like DNS it is broken into two parts, a Server Service (that manages the encoded Jet Database, server to server replication, service requests, and conflicts) and a TCP/IP Client component which manages the client’s registration and renewal of names, and takes care of queries.

VPN (Virtual Private Network)

: It is a virtual computer network that exists over the top of an existing network. The purpose of a VPN is to allow communications between systems connected to the VPN using an existing shared network infrastructure as the transport, without the VPN network being aware of the existence of the underlying network backbone or without the VPN interfering with other network traffic on the backbone. A VPN between two networks is often referred to as a VPN Tunnel. Most VPN technologies can be separated into two broad categories, Secure VPNs and Trusted VPNs.

Internet Protocol version 6 (IPv6):

It is the next-generation Internet Protocol version designated as the successor to IPv4. It is an Internet Layer protocol for packet-switched internetworks. The main driving force for the redesign of Internet Protocol was the foreseeable IPv4 address exhaustion. IPv6 was defined in December 1998 by the Internet Engineering Task Force (IETF) with the publication of an Internet standard specification,

RFC 2460.

IPv6 has a vastly larger address space than IPv4. This results from the use of a 128-bit address, whereas IPv4 uses only 32 bits. This expansion provides flexibility in allocating addresses and routing traffic and eliminates the primary need for network address translation (NAT), which gained widespread deployment as an effort to alleviate IPv4 address exhaustion. Due to its security and flexibility entire Internet will be deployed byIPv6 in 2012 as expected.


In computer networks tunnelling protocol (delivery protocol) encapsulates the different payload protocol i.e., It carries a payload over an incompatible delivery-network. It can also provide a secure path through an untrusted network without any data loss.

Transport Layer Security (TLS):

Transport Layer Security (TLS) and its predecessor, Secure Sockets Layer (SSL), are cryptographic protocols that provide security for communications over networks such as the Internet. TLS and SSL encrypt the segments of network connections at the Transport Layer end-to-end.


In cryptography, encryption is the process of transforming information (referred to as plaintext) using an algorithm (called cipher) to make it unreadable to anyone except those possessing special knowledge, usually referred to as a key. The result of the process is encrypted information (in cryptography, referred to as cipher text).

In many contexts, the word encryption also implicitly refers to the reverse process, decryption.

Internet Key Exchange:

Internet Key Exchange (IKE or IKEv2) is the protocol used to set up a security association (SA) in the IPSec protocol suite. IKE uses a Diffie-Hellman key exchange to set up a shared session secret, from which cryptographic keys are derived. Public key techniques or, alternatively, a pre-shared key, are used to mutually authenticate the communicating parties.

4.IPSec System Architecture

Authentication Header and Encapsulating Security Payload are commonly called “protocols”, though this is another case where the validity of this term is debatable. They are not really distinct protocols but are implemented as headers that are inserted into IP datagram’s, as we will see. They thus do the “grunt work” of IPSec, and can be used together to provide both authentication and privacy.

IPSec protocols:

The IPSec protocol family consists of two protocols: Authentication Header (AH) and

Encapsulated Security Payload (ESP). Both these protocols are independent IP. AH is the IP protocol 51 and ESP is the IP protocol 50

Authentication Header:

This is a member of the IPSec protocol suite. Authentication Header provides connectionless data integrity and data origin authentication of IP packets. Further, it can also provide protection against the replay attacks by using the sliding window technique and by discarding the old packets. Authentication Header also gives protection for the IP payload and all the header fields of an IP datagram.

AH generally operates on the stop of IP, by using the IP protocol number 51.

An AH packet diagram is shown below which describes how an AH packet can be constructed and interpreted:

0 – 7 bit

8 – 15 bit

16 – 23 bit

24 – 31 bit

Next header

Payload length


Security parameters index (SPI)

Sequence number

Authentication data (variable)


Field meanings:

Next header:

This field is an 8-bit field that mainly identifies the type of the next payload obtained after the Authentication Header. The value of this field can be chosen from the set of defined IP Protocol Numbers.


These fields are usually reserved for the future use.

Payload length

This defines the size of Authentication Header packet.

Sequence number

This field represents a monotonically increasing number which is used to prevent certain replay attacks.

Security parameters index (SPI)

This field is used to identify the security parameters, in combination with the IP address, and then identify the security association techniques implemented with this packet.

Authentication data

This field contains the integrity check value (ICV) which is necessary to authenticate the packet. This field may also contain padding.

Encapsulating Security Payload:

ESP which can be expanded as Encapsulating Security Payload is a member belonging of the IPSec protocol suite. IPSec achieves integrity, origin authenticity, and confidentiality protection of packets. This protocol also supports encryption-only and authentication-only configurations. However usage of only encryption technique without authentication is not recommended because it is termed insecure.

ESP does not protect the IP packet header like the Authentication Header (AH) does. The packet diagram below shows how an ESP packet is constructed and interpreted:

0 – 7 bit

8 – 15 bit

16 – 23 bit

24 – 31 bit

Security parameters index (SPI)

Sequence number

Payload data (variable)


Padding (0-255 bytes)


Pad Length

Next Header

Authentication Data (variable)

Field meanings:

Security paramete

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