The Role Of Cryptography In Network Security Computer Science Essay

Network security is concerned with the protection of web resources against change, devastation and unauthorised usage, cryptanalysis and encoding are most critical constituents of web security. In my assignment, as a web security director, I will seek to research “ explore the public presentation of assorted cryptanalytic strategies and measure web security and the security of radio web system ” .

Networks take all sort of sensitive informations and security play a critical function of any radio web system. Security certify degree of informations unity and information confidentiality as maintain wired web, without accurately implement security steps and radio web arranger semen within scope of the web arranger. Security is high deficiency, indolence, and deficiency of cognition and employee are non cognizant of these things, particularly in little administration and place, every administration demand to aware and developing for employees clip to clip.

Cryptology has two constituents, kryptos and Sons. Cryptographic methods to attest the safety and security of communicating and chief end is user hallmark, informations hallmark such as unity and hallmark, non-repudiation of beginning, and confidentiality and it has two maps encoding and decoding.

In my research, as a web security director, I will analyse cryptanalysis, web security, and security of radio web system to implement the web security schemes for the administration in future.

1. Explore and explicate different types of cryptanalysis and measure the function of cryptanalysis in web security.

Cryptography has different methods for taking clear, clear informations, and converts into indecipherable informations of secure communicating and besides transforms it back. Cryptanalysis is besides used to authenticate identify of message beginning and attest unity of it. Cipher send message and usage secret codification. “ The cypher scrambles the message so that it can non be understood by anyone other than the transmitter and receiving system. Merely the receiving system who has the secret codification can decode the original message, therefore guaranting confidentiality. ” ( Citrix-system, 2010 )

Type of cryptanalysis

Following three common types of cryptanalysis as below:

Secret key cryptanalysis is identified as symmetric key cryptanalysis. Both transmitter and receiving system know same secret codification described the key and messages are encrypted by the transmitter and usage key, decrypted by the receiving system. It use individual key for both encoding and decoding. This method works healthy “ if you are pass oning with merely a limited figure of people, but it becomes impractical to interchange secret keys with big Numberss of people ” . Secret key cryptanalysis usage is such as informations encoding criterion, progress encoding criterion, Cast-128/256, international informations encoding algorithm, and rivest cyphers etc. ( Citrix-system, 2010 )

Public key cryptanalysis is called asymmetric encoding and use twosome of keys one for encoding and another for decoding. Key work in braces of coordination populace and private keys. Public key can freely administer the private key. If transmitters and receiving systems do n’t hold to pass on keys openly, they can give private key to communicating confidentially. Public cardinal cryptanalysis usage for cardinal exchange and digital signatures such as RSA, digital signature algorithm, public-key cryptanalysis criterion etc.

Hash maps use a mathematical transmutation to for good code information. It besides called message digests and one manner encoding. Hash map usage to supply a digital fingerprint of file contents and it is normally employed by many runing system to code watchwords and it provide step of the unity of a file. It is besides use message digest, secure hash algorithm, RIPEMD etc. ( Kessler, G,2010 )

The function of cryptanalysis

Many characteristic combine to throw web security to the top issues in the administration and face IS professional daily. Nowadays concern operation decentalisation and correspondence growing of computing machine web is the figure one driver of concern about the web security. Equally far as security concern, many administration webs are accidently waiting to happen, such accident will happen is impossible to foretell but security breaches will happen. When administration web security chooses is 100 % involve cryptanalysis engineering. The undermentioned five basic utilizations of cryptanalysis in web security solution are:

Confidentiality – Cryptanalysis gives confidentiality through altering or concealing a message and protects confidential informations from unauthorised entree and usage cryptanalytic key techniques to critically protect informations ;

Access control – Merely authorized users ( login & amp ; watchword ) can entree to protect confidential informations etc. Access would be possible for those single that had entree to the right cryptanalytic keys ; ( Mitchell, M, 1995 )

Integrity – Cryptanalytic tools give unity verify that permit a receiver to authenticate that message transformed and can non forestall a message from being transformed but effectual to place either planned and unplanned alteration of the message ;

Authentication is the ability to verify who sent a message. It done through the control key because those with entree to the key are able to code a message. Cryptographic map usage different methods to attest that message is non changed or altered. These hash maps, digital signatures and message hallmark codifications.

2. Research encoding for web security.

Encoding for web security

Encoding is the most effectual method to cut down informations loss or larceny to code the information on the web security. Encoding is a procedure of web security to use crypto services at the web transportation bed on top of the informations link degree and under the application degree. Network encoding other name web bed or web degree encoding. The web transportation beds are beds 2 and 4 of the unfastened systems interconnectednesss ( OSI ) is the mention theoretical account, “ the beds responsible for connectivity and routing between two terminal points. Using the bing web services and application package, web encoding is unseeable to the terminal user and operates independently of any other encoding procedures used. Data is encrypted merely while in theodolite, bing as plaintext on the originating and having hosts ” .

Encoding for web security execute through cyberspace protocol security and set of unfastened cyberspace technology undertaking force ( IETF ) criterion and use in combination and construct construction for confidential communicating over IP webs. Internet protocol security works through the web architecture and encrypted packages show to be the same to unencrypted packages and mob through any IP web easy. Network encoding merchandise and services provide several companies such as Cisco, Oracle etc. ( Search security, 2010 )

hypertext transfer protocol: //

Figure – 1 Network Encrypted

3. Critically review the key and watchword direction in footings of web system security.

The cardinal direction

Information go indispensable assets and protects it and handiness is critical for concern success. Encoding is the engineering for making so and go important portion of web system security. Encryption key is really helpful to procure informations and information. There are two types of cardinal public and private key usage to procure the information and web. These key used in cryptanalytic system as below:

Public Key – it was invented in 1976 and mention to code architecture type and use two cardinal braces is encrypt and decrypt. It can utilize to code message and matching private key to decode it. Public cardinal encoding believe highly unafraid because it does non necessitate secret shared key among the transmitter and receiving system. It is helpful for maintaining private electronic mails and stored on mail waiters for many old ages. It plans such as PGP has digital signature ability built message sent can digitally signed.

Private Key – it besides called secret key and encryption/decryption key to interchange secret messages and shared by the communicators so that each can code and decode messages. Public cardinal utilizations with private key together. ( Search-security 2010 )

Password direction

Password is the most of import facet to login into the system and the web. Administration should let merely authorized users to entree to the web and every user entree single login and watchwords to come in the web, its consequence increase the security facets. There are following necessary things to procure watchword in the web system as below:

Long Password – every user demand to hanker watchword because short watchword can really rapidly compromised and analyze the substitution based on the watchword length ;

Change watchword anytime – employee should alter watchword on a regular basis, cipher presume easy and helpful for security breaches of the web ;

Avoid utilize similar watchword – do n’t utilize the same watchword for different histories because it would naive for decision maker to believe and employee should utilize different watchword for safety and security for web system ;

Necessity to altering watchword on a regular basis – employees besides bit by bit more entree their work histories from distant location, user demand to educate/awareness on the required of changing the watchword often. ( Storts, J, 2010 )

4. Compare symmetric and asymmetric encoding systems and their exposure to assail.

Symmetrical encoding systems and their exposure

Symmetric encoding system usage same secret key is used to code and decode information and transform between two keys. Secret cardinal concern to information to transform the content because both can utilize encrypts and decrypts traffic. Symmetric encoding system has two types are:

Stream cyphers – it is spots of information one at a clip and operates on 1 spot of informations at a clip. It is faster and smaller to implement and hold an of import security spread. Certain types of onslaughts may do the information to be revealed ;

Block cyphers – it is encrypts information by interrupting it down into blocks and encrypt informations in each block and this information is fixed sized normally 64 spot and largely use in three-base hit DES and AES. ( Encryptionanddecryption, 2010 )

Symmetrical encoding algorithms including Des, 3DES, AES, and RC4 etc. 3DES and AES are usually used in IP sec and other types of VPNs. RC4 is used on radio webs and used by WEP and WPA for encoding. “ Symmetrical encoding algorithms can be highly fast, and their comparatively low complexness allows for easy execution in hardware. However, they require that all hosts take parting in the encoding have already been configured with the secret key through some external agencies ” . ( Stretch, J, 2010 )

Symmetrical Encryption Vulnerabilities are:

To interrupt symmetric encoding system through beastly force and cryptanalytics ;

Figure-2 Symmetric encoding system

Weak watchword can interrupt symmetric encoding systems ;

Password ever maintain in head or do a backup transcript of the watchword ;

Exchange secret keys in secure mode and stored decently. ( Encryptionanddecryption, 2010 )

To leaking and descrying out watchword.


Asymmetrical encoding systems and their exposure

Asymmetric encoding system use two keys one for encoding usage for public, anyone can code a message and another for decoding usage for private and merely receiver can decode a message, usually set up a cardinal brace within a web and involve in six chief elements are:

Plaintext – Text message applied in algorithm ;

Encoding algorithm – it performs mathematical operation to carry on permutations and transform to the plaintext ;

Public and Private keys – the keys pair where one usage for encoding and other decoding ;

Ciphertext produce encrypt message by using algorithm to plaintext message through utilizing key ;

Decryption Algorithm generates ciphertext and fit key to bring forth the plaintext. ( Encryptionanddecryption, 2010 )

Most common asymmetric encoding is RSA and if comparison with symmetric encoding it is much slower but its capableness to set up secure channel over a non-secure medium such as cyberspace. “ This is accomplished by the exchange of public keys, which can merely be used to code informations. The complementary private key, which is ne’er shared, is used to decode. ” ( Stretch, J, 2010 ) asymmetric_encryption.png

Asymmetrical Encryption Vulnerabilities are:

Figure-3 Asymmetric encoding systemPublic key can be distributed freely ;

It is calculating intensive ;

It process really easy ;

Weak watchword can easy steal ;

Weak encoding to interrupt this system ;

Crash digital signature ;

Security breach at the clip of cardinal exchange.

5. Explain and critically assess web security and critically list down different type web security tools and engineerings.

Web security

Web is really critical function in our day-to-day life such as on-line searching, surfing, clients, sellers, co-staffs, electronic mail, etc but need to be web security and individuality larceny protection. Web security has many jobs like Spam, viruses, security breaches & A ; theft etc. This job with web security is the portion of web of onslaught computing machines and waiters send out spam messages without cognizing it and e-mail / watchwords produce and re-sale to rival.

In my research, security expert says that “ shows you how to “ make something in five proceedingss ” and handily neglect to advert the security deductions of their advice. If it sounds excessively easy to be true, it likely is. A perfect illustration of this is PHP solutions that use a file for informations storage and inquire you to do it writable to the universe. This is easy to implement, but it means that any spammer can compose to this file. ” ( Heilmann, 2010 )

Web security has many hazard and onslaughts such as IP reference place the computing machine, Fixed IP reference is larger security hazard, portion web, staff incognizant security leak in the web scene, SQL injection onslaughts, exploits browsers and web sites, remote file inclusion ( RFI ) , phishing etc. ( Heilmann, 2010 )

Web Security Tools and Technologies

The undermentioned list down of different type of web security tools and engineerings as below:

Spike Proxy

It is a professional class tool for looking for application degree exposures in web application and screen SQL injection and cross-site-scripting ;

Power fuzzer

It capable of spidering web site and identifying inputs and common web exposures such as XSS, SQL injection and support hypertext transfer protocol. Written in python ;

Sec point penetrator

It web security tools based, incursion proving contraption or web based service give exposure scan pen testing and can alter IP reference to scan and study ;

Net spark arrester

It allows users to work the identified exposures and see existent impact of the job. It capable false positive free, managing of web sites that rely on AJAX and JavaScript ;


It uses multiple techniques such as conditional mistakes injection, blind injection based on whole numbers, strings/statements, MS-SQL verbose mistake message and place database version and gather information

Gama Sec

It is automated on-line website exposure appraisal delivers test to net waiters, web based application and web-interfaced system and support HTTP hallmark strategies, HTTP protocol, BASIC etc ;

NIkto Scanner

Open beginning web waiter scanner and execute complete trials against web waiters for multiple points, unsafe files, CGIs, and jobs of the waiter ;

Perimeter cheque

it analyze external web devices such as waiters, web sites, firewalls, routers and security exposures and besides lead to interrupted service, informations larceny, system devastation and assist instantly remedy security job. ( Hower, R, 2010 )


6. Identify exposures and mis-configurations in radio webs.

Vulnerability and mis-configuration describe as some event that exposes administration and web security has ability to work expeditiously its needed confidentiality degree and protects deficiency of the systems.

Wireless webs exposures

Some of the undermentioned common radio webs exposures as below:

No set physical boundaries – radio entree points can lose signals, due to doors, walls, floors, and insularity etc ;

Untrained users puting up unauthorised webs and workstation – untrained users “ who either are uninformed and hence unaware of security steps that must be taken when deploying radio, or whose desire to hold radio is so strong that it wholly overshadows the regulations set by the organisation to guarantee that systems are unafraid ” . ( Lane, H, 2005 )

Rogue entree points – this attack consist of linking illegal entree point on the web ;

Lack of supervising – every administration has some loopholes in monitoring but invasion sensing tools can utilize continuously proctor to procure the web system ;

MAC reference filtrating – it is alone figure assigned and wireless LANs allows entree point to link to web. Filtering can ensue in security breach as user alteration MAC reference, it result individuality larceny ;

Insufficient encoding criterions – weak encoding criterions say that users will non enable it and harmful to wireless LAN as weak encoding ;

Easy to listen in – radio usage airwaves to listen easy on web traffic or connect to web and it consequences the information is encrypted with strong encoding. If WEP encoding usage, hackers can some effort to decode the information ;

Unsecure holes in web – hacker can come in wireless LAN by besieging firewalls and let other to come, as a consequence confidential information lost or may compromise on the web ;

Denial-of-service onslaughts – external causes based is Denial-of-service onslaughts and do web unproductive and forcefully user to unplug continually interrupting operation in the administration such as jamming ( throng a wireless web ) , first-come-first-serve entree ( overload web with malicious connexion ) , spoofed de-authentication frames etc. ( Lane, H, 2005 )

Wireless web mis-configuration

Mis-matched package and hardware – it is job arises for web substructure that is vulnerable to broad scope of onslaughts. Sometime map work decently but terribly mis-configured ;

Service Set ID ( SSID ) – SSID is a configurable designation mechanism to enables a client to pass on with the right base-station. Configured decently with SSID otherwise aggressor can work the SSID in effort to entree base station and alteration SSID watchword and alteration 802.11 security scenes for hallmark. ( Spam-laws, 2009 )

7. Show how to maintain radio web system safe.

Presents, radio web go more common called Wi-Fi /802.11 and let computing machine to link to another without overseas telegrams and utilizing computing machine easier and more convenient than of all time before with fast internet connexion and radio router and surf cyberspace, informations transportation, print paperss, electronic mail, download information etc but unhappily, it besides make easy for outsider/hacker to make the same. Administration should following points to maintain radio web system safe and unafraid as below:

Keep-out unwanted radio invitees – radio web restrict entree through encoding is easy through which encoding or scrambling information to have and direct, merely those can entree with right watchword or encoding key and restrict radio web to normal office hours. Some encoding protect radio web such as wired tantamount protection ( WEP ) , Wi-Fi protected entree ( WPA ) , WPA2 etc ;

Choose strong watchword – in my research, I found some basic guideline when create a radio web watchword is

Password should be longer ( 20 characters ) it takes person to calculate it out ;

Use mixture small letter and uppercase letters ;

Insert Numberss in between letters ;

Change watchword every 3 months ;

Write password down and maintain in safe ( in instance of forget ) .

Use the firewall – it is front security and secures web, computing machines and informations from spying eyes ; ( Bryan, S, 2010 )

Do n’t demo the name of the web ( SSID ) ;

Change default SSID, do n’t utilize name to place the administration ;

Use MAC filtering because each web card is alone codification known MAC reference and entree points to curtail entree to assured ;

Switch over on and utilize constitutional encoding to forestall eavesdrop ;

Restrict user ability ( web decision makers ) to setup speedy and soiled radio web, even temporarily. One knave entree point can undo all the good work you do on the others ;

Attest all security steps are in topographic point, it result defense mechanism against interlopers ; ( Microsoft, 2010 )

Turn off the radio web when it is n’t usage ;

Hide/keep safe topographic point confidential files/data.


I conclude that security of radio web system drama cardinal function in every administration and besides implement all web security schemes for the administration in present and future and unafraid web resources against change, devastation, and unauthorised usage. Cryptanalysis tools and web security tools are besides really helpful to procure the web system and protect IT assets, confidential informations and information.


I recommend some of the of import points as below:

Better instruction and stronger security execution ;

Wireless web consciousness and preparation for employees seasonably ;

Update radio web security seasonably ;

Certify to procure wireless entree point with a strong watchword ;

When it need implement WEP hallmark method ;

Make certain all users have proper key or watchword configured on their system ;

Make certain all service provide to users are protected by terminal to stop encoding ;

Use SSID, MAC reference filtrating allows to configure wireless APs.