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Selected Books and Journals in Cryptography

  • Bruce Schneier: Applied Cryptography, second edition, John Wiley & Sons, 1996. An excellent, practically oriented presentation of cryptographic algorithms, protocols, and methods. Definitely recommended reading. The homepage contains a table of contents, errata and other information.

  • Douglas Stinson: Cryptography: Theory and Practice, CRC Press, second edition, 1996. An excellent, self-contained introduction to cryptography. Used widely as lecture material for university undergraduates. Has been translated to several languages. [homepage]

  • Alfred J. Menezes, Paul C. van Oorschot, and Scott A. Vanstone: Handbook of Applied Cryptography, CRC Press, 1996. An excellent reference book on cryptography. It is more mathematical than for example, Schneier’s book. Contains pseudo-code descriptions of a large number of algorithms and cryptosystems, as well as free samples of all the chapters of the book. [homepage]

  • Neil Koblitz: A Course in Number Theory and Cryptography, second edition, Springer, 1994. An introduction to cryptography through number theory. Very thorough in explaining the number theoretic basis of algorithms needed in cryptography and in particular public key cryptosystems. Gives also a chapter on elliptic curves, which is in fact one of the best introductions to the topic.

  • Eli Biham, Adi Shamir: Differential Cryptanalysis of the Data Encryption Standard, Springer-Verlag, 1993. A comprehensible account of the ground breaking differential cryptanalysis method. The authors explain the differential attack on DES in several stages of increasing complexity. The book also describes differential attacks against several other ciphers and hash functions.

  • Charlie Kaufman, Radia Perlman, and Mike Speciner: Network Security - PRIVATE Communication in a PUBLIC World, Prentice-Hall, 1995. Covers areas of cryptography with practical relevance in an understandable way.

  • Jennifer Seberry and Josed Pieprzyk: Cryptography: An Introduction to Computer Security, Prentice-Hall, 1989. Somewhat more theoretically oriented than the above.

  • Joan Daemen and Vincent Rijmen: The Design of Rijndael, AES - The Advanced Encryption Standard, Springer, 2002. The authoritative guide to the Rijndael cipher, which was chosen to be the AES standard in 2000. This is a well written book by the designers of Rijndael. It contains the mathematical preliminaries, the detailed description of the algorithm, design principles, implementation and optimization issues, and a security analysis, with an introduction to the basics of differential and linear cryptanalysis.

  • Rudolf Lidl and Harold Niederreiter: Introduction to Finite Fields and Their Applications, Revised Edition, Cambridge University Press, 1994. A comprehensive introduction to the mathematical theory of finite fields and some of its most important applications including cryptology.

  • Alfred J. Menezes: Elliptic curve public key cryptosystems, Kluwer academic publishers, 1993. This book is now somewhat dated, but is still a good introduction text to elliptic curve cryptosystems.

  • Ian Blake, Gadien Seroussi, and Nigel Smart: Elliptic Curves in Cryptography, Cambridge University Press, 1999. Almost up-to-date book about the cryptographical use of elliptic curves. Contains a complete explanation of the Schoof-Elkies-Atkin algorithm for point counting. Most of the book can be followed with very little background in algebra.

  • Scott A. Vanstone, Darrell R. Hankerson, and Alfred J. Menezes: Guide to Elliptic Curve Cryptography, Springer, 2004.

  • Advances In Elliptic Curve Cryptography, Ian Blake, Nigel Smart, and Gadien Seroussi eds., Cambridge University Press, 2004.

  • Electronic Frontier Foundation: Cracking DES, 1998. This book describes the breaking of DES by exhaustive search on a real special purpose machine. Contains full design details and some hardware analysis for cryptanalytical attacks.

  • Man Young Rhee: Cryptography and Secure Data Communications, McGraw-Hill, 1994. This book is oriented towards the hardware aspects of cryptography. Contains thorough explanations about cryptosystems such as DES and RSA.

  • Hans Riesel: Prime Numbers and Computer Methods for Factorization, Birkhauser, 1994. Concentrates on prime numbers and factoring large integers, and discusses their application to RSA and other public key methods.

  • Xuejia Lai: On the Design and Security of Block Ciphers, ETH Series in Information Processing, vol. 1, Hartung-Gorre Verlag, Konstanz, Switzerland, 1992. This book contains the description and analysis of the IDEA cipher. It explains Lai’s idea of mixing incompatible algebraic operations together and gives the theoretical basis for such constructions. Further, the book contains material about the differential cryptanalysis of IDEA and why IDEA should be resistant to it. Contains also an implementation of IDEA in C language.

  • Donald Davies and Wyn Price: Security for Computer Networks, John Wiley, 1989. The first edition appeared in 1984, its material on standards and protocols is now fairly dated, but the main sections about DES (including modes, triple DES etc.) and public key cryptography are often very much appreciated by those who are neither mathematicians nor C wizards, but still want to understand what is going on in the algorithms.

  • Handbook of Theoretical Computer Science Volume A: Algorithms and Complexity, J. van Leeuwen ed., Elsevier, 1994. This is a very large collection of survey articles. There is an article by Ron Rivest on cryptography, also an article by Arjen Lenstra and Hendrik Lenstra on algorithms in number theory. All articles have extensive references.

  • Algorithms and Theory of Computation Handbook, Mikhail J. Atallah ed., CRC Press, 1999. A collection of survey papers. Contains many papers on cryptography: mathematical background, basic algorithms, pseudo-random sequences, cryptanalysis and electronic cash.

  • David Kahn: Seizing the Enigma, Arrow Books, 1996. This is a thorough book by David Kahn, the author of The Codebreakers and a well-known historian of cryptography. This book gives an almost complete picture of the Enigma story from the early years to its use in World War II. Highly interesting (to a cryptographer) is the description of the early analysis by Poles (basically by Rejewski) and the later developments in Bletchley Park.

  • Codebreakers: The Inside Story of Bletchley Park, F.H. Hinsley and Alan Stripp eds., Oxford University Press, 1993. This book is a series of recollections by a variety of people that worked in Bletchley Park during World War II. It contains several articles about the actual cryptosystems such as versions of Enigma, Fish, and some codes. Some articles are event based and others very personal. Overall a very good book about Bletchley Park during World War II.

  • Simon Singh: Code Book: The Science of Secrecy from Ancient Egypt to Quantum Cryptography, Anchor Books, 2000. Includes a history of how cryptography has affected the world, from the World Wars to the death of Mary, Queen of Scots. Also takes a look at the future of cryptography.

July 6, 2008 Posted by razvi | Blogroll, Wireless Security | , , , | No Comments

Inevitable Ubiquitous Wi-Fi

Wi-Fi is one of the hottest technologies in enterprise networking, but actual adoption has not been as pervasive as one might believe. A number of issues have combined to make IT managers cautious about rolling out Wi-Fi ubiquitously. Many are still concerned about security, and even where security is implemented, such implementation can be highly complex. Tools are still being developed to assist enterprises in largescale deployment, management and monitoring of Wi-Fi systems.

Companies must also tackle the issue of how to scale Wi-Fi networks from today’s broad-but-shallow deployments to corporate campuses where wireless access is ubiquitous. Standards are continuing to evolve in these and other areas, creating a moving target for investment in Wi-Fi hardware and software.

The bottom line: wireless LAN deployment may not yet be simple, but a wide variety of products and techniques is available today or will be available to address the concerns that trouble most IT administrators.

AirDefense (www.airdefense.net)

Airespace (www.airespace.com)

AirMagnet (www.airmagnet.com)

Airwave (www.airwave.com)

Aruba Networks (www.arubanetworks.com)

Atheros (www.atheros.com)

Berkeley Varitronics (www.bvsystems.com)

CA (www.ca.com)

Cisco (www.cisco.com)

D-Link (www.dlink.com)

Fortress Technologies (www.fortresstech.com)

Hewlett-Packard (www.hp.com)

IBM (www.ibm.com)

Interlink Networks (www.interlinknetworks.com)

KoolSpan (www.koolspan.com)

Network Chemistry (www.networkchemistry.com)

Network Instruments (www.networkinstruments.com)

Newbury Networks (www.newburynetworks.com)

Perfigo (www.perfigo.com)

Proxim (www.proxim.com)

Sniffer (www.sniffer.com)

Trapeze Networks (www.trapezenetworks.com)

Wavelink (www.wavelink.com)

Wi-Fi Alliance (www.wi-fi.org)

WildPackets (www.wildpackets.com)

Wireless Security Corp (www.wirelesssecuritycorp.com)

July 5, 2008 Posted by razvi | Blogroll, Wireless Security | , , , , , , , , , , , | No Comments

Multi-Level Information System Security in Outsourcing Domain

Purpose -

Information security is an integral part of all outsourcing activities and it is important for both the outsourcing company and the vendor to reach agreement as regards what type and what level of information security will be provided by the vendor in relation to the outsourced activities. The aim of this paper is to evaluate the potential risks and information system (IS) security needs when outsourcing takes place and analyse the different security level in outsourcing agreements.

Methodology /Approach -

This paper is primarily based on a review of the literature. International security standards and best security practices are analysed and discussed. A multiple level security framework as an effective approach in outsourcing domain is addressed.

Findings

Information system security risks can be effectively identified, monitored and evaluated by the concept of a layered security model that fits best in the complex outsourcing domain. There are three levels of security, first guidelines of technical security, second risk analysis and, third compliance and evaluation criteria, including managing information security.Originality/ValueThe approach could be used to integrate IS Security with Service Level Agreements. Outsourcing vendors with security certifications, strong security adherence systems and optimal disaster recover plans will have a competitive edge in the industry. Keywords: Information security, outsourcing, risk, compliance, outsourcing agreement.

Paper type: Conceptual

R.Doomun “Multi-level Information System Security in Outsourcing Domain”, 2nd International Business Process Outsourcing and Modelling (BPOM 2006) Conference, 28-30 June 2006, University of Technology, Mauritius. (To be published in Emerald Journal)

May 30, 2008 Posted by razvi | Blogroll, Research, Wireless Security | , , , , , | No Comments

Majority of users leave their wireless networks exposed

Nearly 55% of businesses are leaving themselves vulnerable to hackers by not taking simple steps to protect their wireless networks, according to new research. Among the protocols used by businesses to protect their wireless networks, it is found that 40 per cent use the largely-ineffective wired equivalent privacy (WEP) protocol; staggeringly, 15 per cent use no protection at all.

The research also highlighted a similar lack of security awareness among home users. Forty-eight per cent use the WEP protocol, while 10 per cent use no protection. It is widely acknowledged in the security industry that the WEP protocol is being depreciated as it can protect only against hackers with the most basic programming knowledge. WEP encryption can be hacked in minutes by a determined blackhat with the requisite skills and software.

All home users and businesses are urged to check their configurations and switch to the wi-fi protected access (WPA) protocol. WPA affords home users and businesses a far higher level of security, as it uses a sophisticated key structure that creates new encryption keys as the system is used. This, along with other enhancements provides improved protection and is able to counter successfully the established key recovery attacks on WEP.

As a researcher in the field of wireless security it is known that: “WEP is no obstacle for a shrewd hacker and can be sidestepped in minutes. By configuring wireless networks to WPA, businesses and home users immediately make any hacking attempt significantly more difficult. And the good news is that switching from WEP to WPA typically involves only the flicking of a switch.”

May 30, 2008 Posted by razvi | Blogroll, Wireless Security | , , , , | No Comments

BSc Projects 2007-2008

This academic year 2007/2008, I have supervised three BSc computer Science / BSc information systems final year project. The core project topic was on investigating performance of specific wireless security mechanisms. The project started in August 2007, with two students per project topic offered by the computer science department, and submission due by end April 2008. Hence, the students had enough time to embark on the project from understanding the project objectives, doing analysis and design of the system, implementation and testing. My project were mostly about analysis encryption algorithms used for wireless network security standard.

Project : Performance of Image Encryption using WiFi Protected Access, by Calleemalay Kavishen and Shakeel downlut. The project abstracts are as follows:

Wi-Fi Protected Access (WPA) is a certification program created by the Wi-Fi Alliance which is now part of the IEEE 802.1x. WPA‟s original objective was to overcome the security limitations of the WEP which was once a standalone encryption protocol. WPA implements the Temporal Key Integrity Protocol (TKIP) encryption algorithm which improves WEP by adding two functions namely Key mixing and Michael to the WEP protocol which is composed of two other main functions known as RC4 and CRC-32. Key mixing generates a key for each packet to be encrypted while RC4 takes the key as input, computes a key stream and encrypts the data. Michael and CRC-32 are integrity checks which are used to verify the validity of the data after decryption. The objective of this project is to investigate the encryption of images using the TKIP algorithm and examine how the encryption process behaves when combined with a compression algorithm like JPEG. The motivation of this study is to determine whether compressing an image before the encryption process is more economical in terms of processing time than using the encryption alone. To do this a set of simulations were made with inputs as images of varying size and the output being the execution times of the main components of the TKIP and the JPEG compression algorithms. The results were compared and the combination of the compression and encryption processes was found to be faster by an amount dependent on the image size. A detailed analysis of the TKIP algorithm was also performed and the key mixing function was found to have a low complexity which fitted the restriction of having only few spare cycles available at the time of WEP deployment. The Michael was also found to be less expensive than the CRC-32 function which again fitted the restriction problem. TKIP can thus be deduced to be a good improvement of the WEP algorithm since the TKIP converted WEP into a secured protocol while not consuming a lot more resources.

Project : Wireless Security Software Code Re-engineering by Jay Domah and Sundeep Tengur

The Advanced Encryption Standard is one of the most secure security algorithms to date. It is used by
several organizations, including governmental agencies throughout the world to encrypt and secure data.
As we evolve in a digital world where communication is essential, the number of mobile computing
devices are ever-growing and along with it the need for wireless communication.
Wireless transmissions, by their very nature, are more exposed to attacks as they are not contained in a
restricted medium. Therefore, wireless data transmitted need to be encrypted to preserve their integrity
and ensure the privacy of the communication. Many existing wireless encryption tools such as WEP have
been cracked and their flaws exposed to the world. Since WEP had severe security weaknesses, the
802.11i specification was ratified in 2004 and it proposed the use of CCMP (Counter Mode with Cipher
Block Chaining Message Authentication Protocol) as an encryption protocol. CCMP is based on the
Advanced Encryption Standard (AES) algorithm.
This project aims at optimizing the AES algorithm for wireless transmissions of mobile devices by
reducing the execution time while preserving the encryption strength of AES. The optimised algorithm
developed will preserve and make optimum use of mobile device resources such as CPU clock cycles,
memory and battery power. The objectives also include the investigation of AES in Cipher Block Chaining
(CBC) mode. Several simulations are conducted to analyse the speed, resource consumption and
encryption robustness of AES-CBC to investigate its viability for image encryption usage on common low
power devices.

Project: Security Software Implementation in Wireless Devices by Manesh Mooloo, Sumbhoolaul

As industry moves towards mobile computing, resources like battery life become significantly important for system usability. This project analyzes power consumption of a laptop while executing a security software to determine the most power efficient method. The study focuses on how the different encryption algorithms affect power consumption. Recommendations for transmitting data over wireless network are presented. This study can provide guidelines while writing security software applications for wireless devices that involve data transmission.

http://cse.uom.ac.mu

http://www.uom.ac.mu

May 2, 2008 Posted by razvi | Wireless Security | , , , , , , , , , , , , , , , , , , , , , , , , , | 6 Comments

Mauritius for a safer cyber island

A team of Indian experts, Computer Emergency Response Team India (CERT-IN) in computer technology is in Mauritius (End April – May 200 8) to assist in the setting up a “National Computer Emergency Response Team” CERT-MU which will help to secure computer and IT systems, through security alerts, security awareness and collaboration with key stakeholders in ICT sector.

The official said that CERT-MU had become a priority project on information and communication technologies (TIC) which is aimed at reducing the vulnerability of countries facing cybercrime threats, broadcasting and disseminating alert programmes in the face of such threats, and co-ordinating actions to be undertaken in response to offences committed through the Internet. “CERT-MU will also ensure co-operation between state services, the private sector and the public in such cases”. According to the official, the project will help to create direct jobs in the short term for university graduates in computer technologies, and in the long term a more considerable number of jobs will be created in order to increase the resilience of countries in case of cybercrime threats.

I am referring you to the following very interesting web sites for up-to-date events and information on computer security issues. Several worldwide security events/news are reported on these websites, which I found very useful for those who have a concern about security awareness.

Source:

http://www.crime-research.org/

http://bigblog.com/computer_security.html

Read other articles:

http://www.shvoong.com/writers/razvi

May 1, 2008 Posted by razvi | Wireless Security | , , , , , , , , , , , , , , | 1 Comment

Becoming a Consultant

How to be a security Consultant?

http://www.shvoong.com/writers/razvi

We ( I ) dream of being our (my) own boss, but what does it take to set up a successful business in the real world?

IT security consultants have it easy, as everyone knows. They swan around the city, taking long lunches and even longer holidays, and all for a few meetings, a couple of phone calls and a bit of fiddling around with a BlackBerry. And anyone with some idea about IT security could do this, right? Well, not exactly. Let’s takes a look at the life of an IT security professional going solo, how it’s done, and the highs and the lows.

First, setting up on your own isn’t the right job for everyone. While a large corporation has a department working on each business area, such as IT, marketing, accounts etc, the lone consultant has to take on all these roles, and more. Being a qualified and experienced IT security professional does not necessarily mean an individual can deal effectively with clients, construct and follow a realistic business plan and stick to their own budgets.

“The biggest challenge is to have the combination of required capabilities,”"A technically superior IT professional will also need excellent marketing and personal skills to succeed on their own. It’s all about the nature of the person - a techie guy who communicates through his keyboard is unlikely to be able to present at board-level. We’re talking about business here, so having and adhering to targets, whether performance-related or financial, is crucial. This is a very rare combination, but it is possible to learn these other skills, especially on the business side.”

“You need to be able to approach the entire board convincingly and lucidly, and do the same with the IT department. You have to be comfortable discussing the business case for a job and proving return on investment,” “ it’s important to be able to move customer thinking away from IT as a grudge spend and towards recognising the potential of new technology and ways of working.”

The right qualifications

A consultant also needs to have the raw industry knowledge and the credentials to go it alone. Several years of top-level security experience are critical, as well as specific qualifications. “There are a lot of qualifications to choose from, and there are multiple ways to refine or broaden the focus of your business through taking management or architecture units, for example,” “Establishing relevant and high-quality credentials upfront is the most important area of setting up a consultancy.”

The most widely recognised formal qualifications include those from ISACA (the Information Systems Audit and Controls Association), (ISC)2 (the International Information Systems Security Certification Consortium) and ISEB (the Information Systems Examinations Board). These certifications are globally recognised, a key factor when working with international organisations.

The two most relevant ISACA qualifications, both accredited by the American National Standards Institute, are the CISA - Certified Information Systems Auditor, and the CISM - Certified Information Security Manager. (ISC)2 recommends the Certified Information Systems Security Professional (CISSP), which is accredited by ANSI to ISO Standard 17024:2003. Within this qualification, either the Information Systems Security Architecture Professional (ISSAP) concentration or the Information Systems Security Management Professional (ISSMP) are of most use to freelancers, according to the company.

However, not everyone agrees with this emphasis on education. “Surprisingly it has been found that customers often don’t want to look at qualifications as much as get references for similar work done. Good-quality references are the most important thing to convince customers to take you on.” “You need to be careful about references, and be sure to keep jobs quite separate. The client is not stupid, and if you talk openly about previous work, you can be sure they will be wondering what you will say about them in the future.” Relationships are key to establishing a successful consultancy, but they can also be the biggest challenge. Vendors will be keen to get you signed up to an exclusive deal, while customers will expect you to have wide-ranging knowledge to call upon, as well as having in depth information at your fingertips. So is it better to stay independent or commit to one vendor? “It’s important for consultants to remain independent from vendors,” “You need to partner with them, but not get sucked in further. This can be a bit of a love-hate relationship, as they’ll be keen to pull you in - it can be a delicate balancing act. It is key that you can recommend the appropriate solutions to your clients - bear in mind that the security market changes every two years, so you’ll need to keep up to date.”

Many IT security professionals will come from a background of working with blue-chip companies and should have a pedigree spanning several in order to succeed. “Having set up your own consultancy, you have to reposition your ‘brand’ as separate from your last employed post. This can easily lead to conflicts of interest, which you must be very aware of. Additionally, working with competitors to your ex-employer needs to be kept on a very professional footing.”

Finding the right balance

The most important relationship is that between client and consultant, and again you need to watch out for potential pitfalls. While a consultant should provide value for money, there’s also the issue of giving too much. Essen believes that security audits are a good example. “Some companies with their own IT department are a tricky balance to strike, especially when you’re doing an audit,” “Too much information and they could just implement your suggestions themselves, while too little loses you the work. It’s not always easy to manage how much detail to give.”

Marketing is a tricky area even in established businesses and can easily trip up beginners. Selling yourself too aggressively may alienate customers, or could simply be so successful that you’re inundated with more work than you can do. An added danger of this unbalanced “boom-and-bust” way of working is that it may lead to dry periods when little money is coming in - a real risk for a small business.

So what can IT consultants do to market their offerings in the right way? “Being known in the security field is vital for marketing and business purposes, and an excellent way to raise your profile is by speaking at conferences,” “But make sure they’re targeted at the right market. RSA and Infosec have both been good for me in the past - it’s important to go along and meet the right people. Word of mouth is the best recommendation, and the biggest winner for smaller businesses without a big public profile - you have to make your reputation travel.” “Recommendations are the number-one sales generator. Your reputation will spread itself to a certain extent - you have to ensure that it’s totally spotless, and keep it that way.”

Of course, it’s not just about going it alone whatever your skills. The most successful businesspeople know their own strengths and weaknesses, and play to them. If you don’t have the marketing abilities you need to make IT security consultancy work, then find someone who does. “Partnering with ‘the other half’ is often the most successful way to begin a business,” “It’s all about strengths and weaknesses, as well as self-knowledge.”"You simply have to have a business head to set up on your own. A degree or further qualification in business studies is a good idea, but it’s always difficult to switch between different hats, and it’s important to be able to relinquish parts of the workload to others.”

Naturally, there are benefits to running your own IT security consultancy, such as personal fulfilment, flexibility and job satisfaction. There is also a very practical side. In spite of the consolidation of the security market and moves by giants such as IBM to provide localised consulting services, there is still a large gap in the market for smaller businesses. “The largest consultancies are keenest on bigger projects, purely due to their size, so smaller companies can simply pick out the smaller jobs,”Also, a smaller consultancy can specialise more readily, a move that makes particular sense for the consultant going solo. Setting up a stand that has a fresh, new unique selling point in a fairly crowded market could be the only way to be successful. “The biggest error people can make when considering whether to go it alone is to wait for the best moment to do so - it never comes! It’s certainly better to do it younger, as you can then change your plan more easily. Leave it too late and you might be too old to re-enter business.”

Ultimately, becoming a lone IT security consultant is a long task, and not one to be taken lightly. Without careful, realistic planning and solid business acumen most startups will fail, and you need the right mix of personal attributes to avoid disappointment. For those entrepreneurs who succeed however, it will be the most fulfilling thing they ever do …

http://www.shvoong.com/writers/razvi

April 28, 2008 Posted by razvi | Wireless Security | , , , , , , , , | No Comments

Image Encryption Assignment

This is an interesting assignment set for postgraduate students in the field of ICT. The work is based on the analysis of AES-Rijndael and RC6 block ciphers for digital images. Here are sample abstracts of their work, your comments are welcomed. Detail assignment papers are provided upon request.

By Hemraj Ramsurrun

Visual inspection is not sufficient to analyse the encryption
efficiency of a given algorithm. This paper describes three main
mathematical models: Maximum Deviation, Correlation
Coefficient and Irregular Deviation, as proposed in [1] and [2],
used to evaluate the encryption quality of the RC6 and AES
Rijndael block ciphers when applied to digital images. These
models are centered on the fact that encryption brings a change in
the pixel values of the images and exploit this change to judge
quality of encryption. The results are quoted from the two
reference papers based on which, a few observations are made.
AES Rijndael and RC6 were applied in three modes of operation
namely: ECB, CBC and OFB. It was found that both RC6 and
Rijndael offer good encryption quality with Rijndael being
slightly better. The results obtained in the ECB mode were found
to be less interesting while the Irregular Deviation measuring
factor proved to be most efficient to assess encryption quality.

By S. Ramsaha

The main objective of this work is to study the
encryption efficiency of AES Rijndael algorithm for digital
images by comparing it to RC6. Firstly, the importance of
image encryption is emphasised followed by a review of
Rijndael and RC6 algorithms. Different Bitmap images are
encrypted using the two algorithms based on electronic code
book, cipher block chaining and output feedback modes. The
encryption efficiency is then evaluated based on metrics like
maximum deviation measuring factor, correlation coefficient
measuring factor, irregular deviation measuring factor. Also,
other important metrics like encryption time and throughput
are considered.

By Shobna Jadunundun

Encryption is the most trusted practical security technique to protect users‟ sensitive data especially for multimedia transmission. Consequently, several algorithms have been developed; RC6 and Rijndael being among the most popular. To verify the encryption quality of these two algorithms when applied to different types of bitmap images for example, visual inspection alone is insufficient. Hence, three measuring factors have been considered based on the fact that encryption brings an irregular change in the pixel values of an image. These are Maximum Deviation, Correlation Coefficient and Irregular Deviation and have been used to evaluate the encryption quality of the two block ciphers operated under three modes namely: Electronic Code Book, Cipher Block Chain and Output Feed Back. Discussion of results is taken from those given in papers [1] and [2] and some recommendations have also been suggested. The observations made show that CBC and OFB are better than ECB in hiding image features. Irregular deviation can be used as the only metric to evaluate encryption quality as the results obtained are more conclusive than those of the other two metrics.

April 28, 2008 Posted by razvi | Wireless Security | , , , , , , , , , , | No Comments

Majority of users leave their wireless networks exposed

Nearly 55% of businesses are leaving themselves vulnerable to hackers by not taking simple steps to protect their wireless networks, according to new research. Among the protocols used by businesses to protect their wireless networks, it is found that 40 per cent use the largely-ineffective wired equivalent privacy (WEP) protocol; staggeringly, 15 per cent use no protection at all.

The research also highlighted a similar lack of security awareness among home users. Forty-eight per cent use the WEP protocol, while 10 per cent use no protection. It is widely acknowledged in the security industry that the WEP protocol is being depreciated as it can protect only against hackers with the most basic programming knowledge. WEP encryption can be hacked in minutes by a determined blackhat with the requisite skills and software.

All home users and businesses are urged to check their configurations and switch to the wi-fi protected access (WPA) protocol. WPA affords home users and businesses a far higher level of security, as it uses a sophisticated key structure that creates new encryption keys as the system is used. This, along with other enhancements provides improved protection and is able to counter successfully the established key recovery attacks on WEP.

As a researcher in the field of wireless security it is known that: “WEP is no obstacle for a shrewd hacker and can be sidestepped in minutes. By configuring wireless networks to WPA, businesses and home users immediately make any hacking attempt significantly more difficult. And the good news is that switching from WEP to WPA typically involves only the flicking of a switch.”

http://www.shvoong.com/writers/razvi

April 27, 2008 Posted by razvi | Wireless Security | , , , , , , , , , | No Comments

War of the Airwaves

As new wireless standards are being adopted, the next generation of wireless security tools are being developed to combat ever-changing threats. Wireless deployments are moving from pilot, to production, to mission critical. However, the bad news is that more wireless devices means more hackers exploiting the vulnerabilities of wireless LANs. Wireless has become the new attack frontier. Tools that are currently being used to attack wireless networks include WEP cracking, exploitation of authenticated clients in 802.1x environments, interception of authentication credentials etc. New stealth tools are being designed to bypass many security measures making the attackers invisible to the network and its defenses. This makes most firewalls obsolete and leaves devices exposed, allowing attackers to send and manipulate data and exploit devices at will. These efforts are well organized, well financed and intensely motivated leading to a dangerous onset of organized crime. This is the “War of the Airwaves”.

Check other articles

April 25, 2008 Posted by razvi | Blogroll, Wireless Security | , , , , , | No Comments