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Annotated overview of publications (English)

Master's thesis

Engelfriet, A., Digital signatures in the Dutch government. (Dutch) (PDF)
Digital signatures are often used to ensure the integrity of electronic messages. Additionally, certificates are necessary to determine the identity of the person who placed the signature. This report discusses the technical, organisational and legal aspects of setting up a public-key infrastructure for use inside the Dutch government which can provide certificates and digital signatures.
Master's thesis, May 1999.

Legal aspects of Internet

Engelfriet, A., Slegers, W. en Kuijpers, F., Inzake bescherming - het JUR rapport. (Dutch) (HTML, Postscript, GZip'ed Postscript)
The final report of the JUR-working group of MCGV STACK. Discusses the most important legal aspects of offering Internet access for members of STACK. Also includes draft agreements for users.
Engelfriet, A., Jans, E. en Claassens, J., (Dutch) (PDF, Postscript, GZip'ed Postscript)
Discussion of issues of copyright, brand names and technical possibilities and limitations concerning registration and maintenance of domain names.

Anonymity and privacy

Engelfriet, A., Anonymity and Privacy on the Internet. (HTML)
Index with information about the most important aspects of anonymity and privacy on the Internet. Covers the use of remailers, encryption programs, security of computer systems and data storage. Also has a large amount of links to related Web sites.
Engelfriet, A., The PGP Frequently Asked Questions (with answers). (HTML)
Answers to the most frequently asked questions about the freeware encryption- and authentication program ``Pretty Good Privacy'' (PGP). Covers installation, terminology, key management, using the program for encryption, decryption and authentication and third party utilities.
Engelfriet, A., Anonimiteit en privacy op het Internet. (Dutch) (HTML)
An introductory article about the possibilities to participate anonymously in Usenet disussion groups and to send anonymous e-mail. Based on the situation in 1996.
Published in Tekst[blad] volume 2 issue 1, 1996.
Engelfriet, A., An introduction to anonymous remailers, 1996. (HTML)
A short introduction to anonymous remailers, written shortly after the remailer shut down.
Engelfriet, A., Ontwricht encryptie de samenleving?. (Dutch) (HTML, Postscript, GZIP'ed Postscript)
This article about the dangers of allowing encryption and the possibilities of restricting its usage was published in the reader of the 1997 congress of the Eindhoven University's Peace Center, titled ``Does the Internet disrupt society?''.
Engelfriet, A. en Zegers, M., Toepassingen van ontkenbare encryptie. (Dutch) (Postscript, GZip'ed Postscript)
Paper on techniques to encrypt data in such a way that during decryption under threat, the sender and the recipient can produce an alternative plaintext. This allows them to deny having sent the original text.
Engelfriet, A., Wis je websporen uit. (Dutch) (HTML)
In the last few years a large amount of new possibilites to become anonymous on the Internet have become available, but new threats to user privacy have also appeared. This article discusses the situation in 1998. Includes tips and a list with relevant Web sites.
Published in Link 52, 1998.
Engelfriet, A., Je mag alles van me weten... behalve m'n wachtwoord!. (Dutch) (HTML)
The first line of defense against computer burglary is always the choice of a good password. This article discusses several methods to pick strong passwords and gives a list with many "unsafe" passwords.
Published in Link 54, 1998.
Engelfriet, A., Tot hier en niet verder. (Dutch) (HTML)
There are several ways in which a computer breakin can be prevented. Denial of service, data theft and backdoors are the most important dangers for the common Internet user. This article discusses these dangers and explains how to protect against them.
Published in Link 55, 1998.
Engelfriet, A., Veilig versleuteld verstuurd. (Dutch) (HTML)
Data which is sent over the Internet can easily be "sniffed" by a third party. To prevent information from falling into the wrong hands, sender and receivers can use encryption. Protocols such as SSL or S-HTTP play an important role in the safe communication between browsers and servers.
Published in PC-Active 11/98, December 1998.
Engelfriet, A., E-mail incognito. (Dutch) (HTML)
Just like Web server security, e-mail security can use encryption to prevent eavesdropping. Because of the different application, the techniques used are different now. This article discusses the protocols and standards available for e-mail encryption, in particular S/MIME and PGP.
Published in PC-Active 1/99, January 1999.
Engelfriet, A., Hier tekenen, alstublieft. (Dutch) (HTML)
It is very easy to send e-mail under someone else's name, or even completely anonymous. With "normal" mail there is always the signature -- for e-mail, there is a corresponding system, the digital signature. This requires a trusted third party which assists in verifying the genuineness of a digital signature.
Published in PC-Active 2/99, February 1999.
Engelfriet, A., Digitaal spoorzoeken. (Dutch) (HTML)
Without unforgeable digital signatures, it is always possible to send forged e-mail. These forgeries can vary from simple joke messages which clearly are fake, to carefully constructed messages under someone else's name. This article gives some hints on how to trace the real sender of a message.
Published in PC-Active 3/99, March 1999.
Engelfriet, A., Besmet! (Dutch) (HTML)
Computer viruses still often make the news, especially the new brand of macro virusses. To detect and remove a virus, it is necessary to know first what it does and how it can be recognized. And what is the difference with a Trojan Horse?
Published in PC-Active 4/99, April 1999.
Engelfriet, A., Elektronische vandalen (Dutch) (HTML)
Denial of service, installing viruses and backdoors are all examples of electronic vandalism. What kind of people are doing this? And when will an ordinary user get involved in all this?
Published in PC-Active 5/99, May 1999.
Engelfriet, A., Digitale fortificatie (Dutch) (HTML)
A firewall is an important help in keeping unwanted digital visitors out. With a firewall, traffic to and from the local system can be limited and controlled. A firewall can also perform other duties, such as acting as a central server for a home network.
Published in PC-Active 6/99, June 1999.
Engelfriet, A., Betrouwbaar beveiligd (Dutch) (HTML)
There is a plethora of security tools available today. Advertisements promise the most exotic features and optimal security against all possible attacks and intruders. But how can a user know whether a program is really secure? And what is really important in an encryption program?
Published in PC-Active 7/99, July/August 1999.

Hypertekst and hypermedia

Engelfriet, A., The Wilbur Reference. (HTML)
One of the most popular parts of the Web site of the Web Design Group is this complete overview of all elements from the HTML 3.2 standard. Every element is discussed, including attributes, limitations in current implementations as well as tips for safe usage.
Engelfriet, A., Style guide for online hypertext. (HTML)
This style guide gives the Web author an overview of the most important aspects of designing Web documents. The focus is on designing in such a way that the document is as readable as possible for the largest audience.
Engelfriet, A., HTML - Hypertext Markup Language. (Dutch) (HTML)
An introductory article about the origin and the philosophy of the HyperText Markup Language (HTML), with which Web documents are written. Discusses amongst other things the differences between writing on paper and writing for the Web.
Published in Impact volume 2 issue 6, 1996.
Engelfriet, A., De nieuwe HTML 4.0 standaard. (Dutch) (HTML)
A short explanation of the origin and the possibilities of the new standard of the HyperText Markup Language, version 4.0.
Published in StackPointer 14.2, 1997.
Engelfriet, A., Webpagina's schrijven: ik zie niet wat jij ziet. (Dutch) (HTML)
Many designers of Web documents assume that what they see in their browser on their computer is identical to what all readers of the document see. This article explains why this is not the case, and how a designer should handle this.
Published in Tekst[blad] volume 4 nummer 2, 1998.
Engelfriet, A., What's in a name? - De ontleding van een URL. (Dutch)
A short descriptive article of the structure and definition of a Uniform Resource Locator (URL), which is used to identify every resource on the World-Wide Web.
To be published in Link 53, 1998.
Engelfriet, A., Ergonomische aspecten van hypermedia. (Dutch)
Literature study on the possibilites to offer and organize hypertext information in a user-friendly and consistent way.
Not yet published.