This list contains only a small selection of sites about cryptography within the Internet.
Further links are contained within the download programs of CrypTool and within the book delivered with CrypTool. We appreciate your advice on further interesting links.
The website of Bill Buchanan, a Professor at the Edinburgh Napier University is one of the most extensive web sites for practically learning encryption methods.
The Kryptologikum is a collection of KIT with many historical exhibits in display cabinets, plus many hands-on experiments, where everyone can learn in a playful way about the principles of modern cryptography. http://kryptologikum.de/index.html
Emma's blog with a 1-page overview about crypto resources. This blog at Norton360Online is educational, and avoids – to our knowledge – any 'marketing'. https://www.nortonsecurityonline.com/security-center/cryptography-resource-guide.html
Website with nearly all in the GDR used codes and encrytion mechanisms -- (only German) http://scz.bplaced.net
Good reading introductionary paper by Scott Aaronson: "The Prime Facts: From Euclid to AKS" http://www.scottaaronson.com/writings/prime.pdf
The Prime Pages by Chris Caldwell http://www.utm.edu/research/primes
GIMPS (Great Internet Mersenne-Prime Search) http://www.mersenne.org
The Spy Camp ("Spioncamp") -- (German only) https://ddi.uni-wuppertal.de/website/index-ddi.html
The "Spy Camp" of the University of Wuppertal offers learning stations for cryptography and cryptology. These include ready-made station sheets, worksheets, solutions and templates for printing, which teachers and pupils can use to start immediately. It is primarily intended for Sek I, but parts can also be used in the lower school and in Sek II (High school level classes and Junior high school level classes).
Educational project: "Zahlentheorie in der Schule – Von Primzahlen zur Verschlüsselung mit RSA" -- (German only) http://www.hydrargyrum.de/kryptographie
Teaching series: E-mail (only?) for you (Gramm et al., 2011)
Main link: http://www.informatik-im-kontext.de
More links in German:
Here, the topic of encryption is dealt with in the context of "electronic mail". The aim of the teaching unit is to enable students to deal consciously and securely with the medium of e-mail. The principle of RSA encryption is made plausible to the learners at secondary level I with a minimum of mathematics. The means for this are on the one hand an animation on asymmetric encryption (see link) and the RSA demo from CrypTool 1.4.30.
The Mathematical Atlas (index using mathematics subject classification), Number Theory (Wayback Archive 2015) http://web.archive.org/web/20150417080205/http://www.math-atlas.org/welcome.html
+Plus, an internet magazine produced by the Millennium Mathematics Project at the University of Cambridge http://plus.maths.org
Randall K. Nichols (Lanaki): "Classical Cryptography Course vol 1+2", 1995 http://www.apprendre-en-ligne.net/crypto/bibliotheque/lanaki/lesson1.htm
John Savard: "A Cryptographic Compendium". This web site features an extensive section concerning cryptography, especially about Rijndael. Website seemingly no longer updated since 1999. http://www.quadibloc.com/crypto/jscrypt.htm
Wonderful Cryptography – topics for a motivational 'Introduction to Cryptography', lecture by Eran Tromer http://www.tromer.org/wondercrypt
Josh Lake: "What is steganography and how does it differ from cryptography?" An exhaustive guide to steganography. https://www.comparitech.com/blog/information-security/what-is-steganography
Gary C. Kessler: "An Overview of Cryptography". Modern and practical paper explaining the concepts behind basic cryptographic methods and providing some real examples. http://www.garykessler.net/common/crypto.html
Craig P. Bauer: "Secret History: The Story of Cryptology", 1st edition, 2013, CRC Press.
Johannes Buchmann: "Introduction to Cryptography", 2nd ed, 2004, Springer.
Claudia Eckert: "IT-Sicherheit Konzepte - Verfahren - Protokolle", 10th edition, 2018, Oldenbourg -- (German only) https://www.degruyter.com/view/title/530046
Keith M. Martin: "Everyday Cryptography – Fundamental Principles and Applications", March 2012, Oxford University Press
Alfred J. Menezes, Paul C. van Oorschot and Scott A. Vanstone: "Handbook of Applied Cryptography", 1997, CRC Press http://www.cacr.math.uwaterloo.ca/hac/index.html
Rolf Oppliger: "Contemporary Cryptography, Second Edition", 2011, Artech House http://books.esecurity.ch/cryptography2e.html
Christof Paar and Jan Pelzl: "Understanding Cryptography – A Textbook for Students and Practioners", December 2009, Springer This is pedagogically one of the best crypto books currently available. It describes all crypto schemes of practical relevance while avoiding to be shallow. The companion website has extensive PowerPoint slides for teachers, links to further information and videos of 28 lecturers (in German only). http://www.crypto-textbook.com
Klaus Schmeh: "Kryptografie – Verfahren, Protokolle, Infrastrukturen", 6th edition, 2016, dpunkt -- (German only). This is a comprehensive and easy to read book. http://www.dpunkt.de/buecher/3316/kryptografie.html
Klaus Schmeh: "Codeknacker gegen Codemacher. Die faszinierende Geschichte der Verschlüsselung", 2nd edition, 2007, W3L -- (German only) This is most current among the books dealing in a comprehensive manner with the history of cryptology. It contains a small collection of solved and unsolved crypto riddles.
Victor Shoup: "A Computational Introduction to Number Theory and Algebra", Second Edition, 2008, Cambridge University Press http://shoup.net/ntb
William Stallings: "Cryptography and Network Security", 2006, Prentice Hall http://williamstallings.com
Mark Stamp and Richard M. Low: "Applied Cryptanalysis: Breaking Ciphers in the Real World", 2007, Wiley-Interscience The according website has a lot of powerpoint slides and challenge problems. http://www.cs.sjsu.edu/~stamp/crypto
Mark Stamp: "Information Security: Principles and Practice", 2nd edition, 2011, Wiley It is a comprehensive book divided into four main themes Cryptography, Access Control, Protocols, and Software. Throughout the book the author included frequent "humorous" footnotes. The according website offers a wealth of additional, free material: http://www.cs.sjsu.edu/~stamp/infosec
The CryptoBooks page offers a bibliography with more than 500 books about cryptology from the 15th century until now, presented in a very attractive GUI. From many of the old books there are high-quality photos available. https://cryptobooks.org
Cryptography and Security by Ron Rivest (website seemingly no longer updated) http://theory.lcs.mit.edu/~rivest/crypto-security.html
The PKI page by Stefan Kelm http://www.pki-page.info
Simon Singh's Webpage, author of "The Codebook" http://simonsingh.net/cryptography
At the bottom of the History of Cryptography page you will find links and books with a historical focus.
The DECRYPT Project: Automatic Decryption of Historical Manuscripts https://de-crypt.org
The Portal of Historical Ciphers (HCPortal) contains a database of cryptograms and useful tools for historical ciphers. https://hcportal.eu
heise Security – computer security news -- (German only) http://www.heise.de/security
heise article about recommendation for crypto methods used in IT security -- (German only) Kryptografie in der IT – Empfehlungen zu Verschlüsselung und Verfahren
German federal ministries page about Internet and Computer security -- (German only) https://www.bsi-fuer-buerger.de
Computer Security Resource Center and AES page at NIST http://www.nist.gov
Cryptome archives http://cryptome.org
ACA (The American Cryptogram Association) is dedicated to promoting the hobby and art of cryptanalysis. You have to become a member (subscription) to get the 2-monthly issue of "The Cryptogram". http://www.cryptogram.org
Crypto Programs is a site to create and solve classical ciphers online. It can create 61 different classical cipher types and solve 45 cipher types including some used during World Wars 1 and 2. http://www.cryptoprograms.com
Dirk Rijmenants' Cipher Machines and Cryptology Historical and technical information about WW2 crypto machines and some nice according free software simulators. https://www.ciphermachinesandcryptology.com/index.htm
The Crypto Museum website is a virtual museum in The Netherlands. https://www.cryptomuseum.com/index.htm
International Conference on Cryptologic History (ICCH), a website for crypto history enthusiasts and crypto device collectors. https://www.cryptologichistory.org
Geoff's Crypto page A page under (permanent) construction with WW2 crypto messages and historic cipher machine simulators. http://www.hut-six.co.uk
A web site with a concise summary of the basics of cryptography and cryptanalysis. In addition there is also a glossary and a list of influential figures in the field of cryptography. -- (German only) http://www.kryptowissen.de
CryptoCrack – A Windows program for solving a whole bunch of classical ciphers with various options. https://sites.google.com/site/cryptocrackprogram
The CrypTool project on Wikipedia http://en.wikipedia.org/wiki/CrypTool