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In December 2021 we released "CrypTool 2 – 2021.2", the second release this year. The last CrypTool 2 release was published in May 2021. Probably the most interesting new implementation of CrypTool 2 is the blockchain simulation. With the blockchain component and its templates, you can simulate a blockchain. The blockchain

CrypTool 1.4.42 was published on December 21, 2021. Compared to CrypTool 1.4.41, this version contains a range of small bug fixes and improvements for CrypTool 1 (CT1). The open-source project CrypTool (CT) creates the most widespread e-learning programs for cryptography and cryptanalysis. The CT programs are used at many schools and universities

In May 2021, we published the release "2021.1", which is the first one this year and a major functional update. The last CT2 release was published in April 2020. A YouTube video showing the changes in the new version can be watched here: <a href="https://www.youtube.com/watch?v=zfjRzK244Jo" target="_blank">What is New in the CrypTool

import { Button } from "@chakra-ui/react" Version 1.0 of JCrypTool was released today, November 30th, 2020. It is intended for beginners and experts in cryptography alike. JCrypTool is available in English and German. Already bundled are over 100 plugins that cover classical and modern cryptography. [View a full list of included

import { Alert } from "@chakra-ui/react" In the course of 2020, the [CrypTool portal](/en) was comprehensively renewed once again. The website at [www.cryptool.org](/en) was originally created in 2003 for [CrypTool 1](/en/ct1) and has been rebuilt into the "CrypTool portal" in 2008 with the addition of [CrypTool 2](/en/ct2) and [JCrypTool](/en/jct). 2009 it

The next edition of the CODEBREAKERS International Cryptology Game is just starting! It mixes short lectures about the secrets of the ENIGMA cipher machine with interesting challenges. The challenges are presented in 3 levels (Trial, Basic, and Advanced). For the Basic and Advanced levels, teams are invited to participate; for the

The RSA algorithm for public-key cryptography is based on the presumed difficulty of factoring large bi-prime integers, the factoring problem. However, as pointed out in Lenstra et al [^1] it is possible, given a set of moduli, to factor some of them by finding shared primes. This way the factoring

In April 2020, we published the first release of CrypTool 2 (CT2) this year, named "2020.1". This is a major functional update (compared to the last release "2018.3"). In this release, we improved the performance of the Workspace Manager significantly as well as of CT2 in general. Additionally, we updated several

The CrypTool 2 (CT2) project is active on several social media platforms. On the one hand, there has been the Facebook page for several years, which reached 1000 subscribers this weekend. On the other hand, there is our YouTube channel since October, which has reached more than 100 subscribers in parallel. On

On November 8, 2019, the student crypto sponsored by Deutsche Bank took place for the ninth time at the [Kelkheimer Eichendorffschule](http://www.eichendorffschule.net). The students of the two mathematics labs of EDS and the students of the computer science basic course of the Main-Taunus-Schule Hofheim took part. With new tasks and CrypTool

End of October 2019, many members of the CrypTool team as well as invited guests met in Munich to celebrate the 20th+ anniversary of the CrypTool project. The event took place at the research institute CODE of the university of the Bundeswehr and was organized by the working group "Datenschutz und

The contest runs from October 21st to end of November 2019. This game mixes short lectures about the secrets of the ENIGMA cipher machine with interesting challenges. Registration is open already under [THE CODEBREAKERS](http://www.thecodebreakers.org). The challenges are presented in 3 levels (Trial, Basic and Adventure). For the Basic and Adventure levels, teams are

JCrypTool weekly builds are based on the latest Eclipse version 2019-06 since July 2019. Since the latest weekly builds since July 2019, JCrypTool is based on the latest Eclipse version 2019-06 and benefits from all its improvements. The next stable version of JCrypTool will be based on this Eclipse version as

The [new release version](/en/ct2/downloads) of CrypTool 2.1 was published on Dec 19, 2018. This "Xmas version" is available in 3 languages (German, English, and Russian). It contains many small improvements and a direct connection to the Swedish DECODE database for encrypted, historical documents. The open-source project CrypTool (CT) creates the most widespread

On 2018-11-09 the student crypto sponsored by Deutsche Bank took place for the eighth time in the [Kelkheimer Eichendorffschule](http://www.eichendorffschule.net). At the student crypto, teachers and students of the upper school could immerse themselves in the science of secret language (cryptology) and try out the procedures themselves, both manually and with the

A new release of CrypTool 1 was published on March 27, 2018. This mature version is available in 6 languages (German, English, Spanish, Polish, Serbian, and French). Compared to 1.4.40, it contains many small bug fixes and corrections (especially for functions using Animal, Flash, HTML, and PDF). The open-source project CrypTool (CT)

On 2018-04-28 the sixth student crypto took place at the University of Kassel. As in the previous five years, the student crypto were again a cooperation between the [Department 16 Electrical Engineering/Computer Science][eecs] of the University of Kassel and the [Schülerforschungszentrum Nordhessen (SFN)][sfn]. On the student crypto, students and teachers

On 2018-01-29 a student crypto took place in Hanau at the [Karl-Rehbein-Schule](http://www.karl-rehbein-gymnasium.de/pages/kontakt.php).

On 2017-11-03 the student crypto, sponsored by Deutsche Bank, took place for the seventh time in the [Kelkheimer Eichendorffschule](http://www.eichendorffschule.net). At the student crypto, teachers and their high school students could learn the science of the secret language (cryptology) and try it out for themselves.

On 2017-10-05 the fifth Scholar Crypto took place at the University of Kassel. As in the previous four years, the Scholar Crypto were again a cooperation between the [Department 16 Electrical Engineering/Computer Science][eecs] of the University of Kassel and the [Schülerforschungszentrum Nordhessen (SFN)][sfn]. On the Scholar Crypto, students and teachers of

A new release of CrypTool 1 was published on September 21, 2017. This version is available in 6 languages (German, English, Spanish, Polish, Serbian, and French), and it contains many bug fixes and corrections. The open-source project CrypTool (CT) creates the most widespread, free e-learning programs for cryptography and cryptanalysis. The CT

On 2016-11-25 the Scholar Crypto, sponsored by Deutsche Bank, took place for the sixth time in the [Kelkheimer Eichendorffschule](http://www.eichendorffschule.net). At the Scholar Crypto, teachers and their high school students could learn the science of secret language (cryptology) and try it out for themselves.

The ZKM will perform the recently released interview film "A Good American" by Fritz Moser on 16 December 2016 in Karlsruhe. Details of the event can be found here: [http://zkm.de/event/2016/12/sicherheit-oder-datenschutz-ein-falscher-gegensatz](http://zkm.de/event/2016/12/sicherheit-oder-datenschutz-ein-falscher-gegensatz) Following the documentary "Citizenfour" by Laura Poitras (2014) and the feature film "Snowden" by Oliver Stone (2016), this section now describes how

The website CryptoPrograms [http://www.cryptoprograms.com](http://www.cryptoprograms.com) is dedicated to create and solve classical ciphers online. New on this site are analyzers for solving classical ciphers without any knowledge of the keyword and, in many cases, the key length. Routines for solving around 40 cipher types are provided.

**JCrypTool 1.0.0 Release Candidate 8** is available for [download](/en/jct/downloads)! This release contains a lot of bugfixes, feature enhancements and new crypto plug-ins. Thanks to all our contributors! All changes are listed on the [Core Issues](https://github.com/jcryptool/core/milestone/5?closed=1) and on the [Crypto Issues](https://github.com/jcryptool/crypto/milestone/5?closed=1) pages.

The Cyber Security Challenge Germany (CSCG) is a hacker competition for pupils and students. Starting on 2 May 2016, the young hackers face the 12 online challenges, which have to be solved by the beginning of August. For each challenge the participants can get points. The best 10 pupils and the

On 2016-04-18 the fourth Scholar Crypto took place at the University of Kassel. As in the previous three years, the Scholar Crypto were again a cooperation between the [Department 16 Electrical Engineering/Computer Science][eecs] of the University of Kassel and the [Schülerforschungszentrum Nordhessen (SFN)][sfn]. On the Scholar Crypto, students and teachers

To conclude the "Global Control and Censorship" exhibition, the Karlsruhe IT Security Initiative (german: "Karlsruher IT-Sicherheitsinitiative", KA-IT-Si), the Competence Center for Applied Security Technology (german: "Kompetenzzentrum für angewandte Sicherheitstechnologie", KASTEL), and the CyberForum e.V. invite you to the 4th season of the Anti-Price Party at the ZKM Karlsruhe on Friday,

The [exhibition](http://zkm.de/event/2015/10/globale-global-control-and-censorship) is for young and old. It opens eyes to worldwide surveillance and censorship, and offers Edward Snowden a fully furnished room, if German politicians and judges have the courage to grant a persecuted and worldwide awarded whistleblower the right to stay. Start Sat, 03.10.2015, end Sun, 07.08.2016.

On 2015-11-06 the [Scholar Crypto](http://www.eichendorffschule.net/Aktuelles/Nachlese/Schuelerkrypto-2015-E1690.htm) sponsored by Deutsche Bank took place for the fifth time in the [Kelkheimer Eichendorffschule](http://www.eichendorffschule.net). On the Scholar Crypto, teachers and their high school students can learn the science of secret language (cryptology) and try it out for themselves.

On 1st of June 2015 the first of 6 tasks starts on the Enigma level. For three weeks two times per week new documents with tasks are published. Most important is the time that you need for the final task. Notes, time bonuses and "cryptologic bombs" help to solve the tasks.

On April 20, 2015, the third Scholar Crypto took place at the University of Kassel with over 80 participants. Like last year, this Scholar Crypto is a cooperation project between the [Department 16 Electrical Engineering/Computer Science][eecs] of the University of Kassel and the [Schülerforschungszentrum Nordhessen (SFN)][sfn]. At the Scholar Crypto,

The [release version](/en/ct2/downloads) of CrypTool 2.0 was released on 20th Aug 2014. We would be happy if many of you use it for teaching, self-study, education and awareness and give us feedback.

A level X challenge in MysteryTwister by Klaus Schmeh using the [double-column transposition](https://www.mysterytwister.org/en/challenges/level-x/double-column-transposition) cipher withstood a long time against cryptanalysis efforts. Nevertheless, it was solved in November 2013 by George Lasry. The according attack against the double-column transposition cipher was just described in the journal Cryptologia and is now implemented in

On 2014-04-29, another Scholar Crypto took place at the University of Kassel. Like last year, this Scholar Crypto was a cooperation project between the [Department 16 Electrical Engineering/Computer Science][eecs] of the University of Kassel and the [Schülerforschungszentrum Nordhessen (SFN)][sfn]. At the Scholar Crypto, students and teachers of the upper school can

The 10th [Beta](/en/ct2/downloads) of CrypTool 2 was released on 19th October 2013. You are cordially invited to test and give feedback. Final version of CT 2 is planned to be published in July 2014.

On 2013-11-07 the [Scholar Crypto][scr], sponsored by Deutsche Bank, took place for the third time in the [Eichendorff Schule][schule] in Kelkheim. At the Scholar Crypto, teachers and their high school students can learn the science of secret language (cryptology) and try it out for themselves. [scr]: http://www.eichendorffschule.net/Aktuelles/Nachlese/SchuelerKrypto-2013-E1453.htm [schule]: http://www.eichendorffschule.net

#### Crypdroid - Are apps a good idea? [Crypdroid][crypdroid] encrypts messages with AES and encodes the ciphertext in a way that it could be sent as a normal text message. It is compatible with the dedicated tool within CT2. Smartphone owners visiting the CrypTool project can find cryptographic algorithms on the [CrypTool-Online

On 2013-04-15, the Scholar Crypto took place for the first time at the University of Kassel. This Scholar Crypto is a cooperation project between the Department 16 Electrical Engineering/Computer Science of the University of Kassel and the Schülerforschungszentrum Nordhessen of the University of Kassel, funded by the Robert Bosch Foundation. At

A spyhunt consisting of 9 missions - Along with the new Jazz album of the Henning Wolter Trio there is a free online game [Undercover Job](http://www.undercover-job.com). Henning Wolter also is the author of two MTC3 challenges [Music Code - Part 1][1] und [Music Code - Part 2][2]. [1]: https://www.mysterytwister.org/de/challenges/level-1/musik-code--teil-1 [2]: https://www.mysterytwister.org/de/challenges/level-2/musik-code--teil-2

The 9th [Beta](/en/ct2/downloads) of CrypTool 2 was released on 20th December 2012. You are cordially invited to test and give feedback.

The new [CrypTool 1.4.31 beta 05](/en/ct1/downloads) is ready. You are cordially invited to test and give feedback. Final version of CT 1.4.31 is planned to be published mid 2013.

The new [CrypTool 1.4.31 beta](/en/ct1/downloads) is ready. This version is now available in 6 languages German, English, Spanish, Polish, Serbian and Greek. We would appreciate if you test this beta in detail and give us feedback. The release version of CT 1.4.31 is scheduled for mid 2014.

On 2012-02-28 - 2012-03-01 the [student crypt of the bbz in Siegen ](https://www.bbz-siegen.de) took place again. <br /> At the Scholar Crypto, teachers and their students of the upper school can learn the science of secret language (cryptology) and try it out for themselves. The Scholar Crypto took place on three days:

The new CrypTool Portal has been gone live on 12th January 2012.

This course explains the inner workings of cryptographic functions and how to correctly use them. The course starts till end of March 2012 and will last at least 5 weeks. Normally, students have to work through the exercises in the same week the lessons are published. <br /> You can find more details at

For [CrypTool 1](/en/ct1) it is planned to further on release only bugfix versions. The next one is 1.4.31. New features are going into the successors [CrypTool 2](/en/ct2) and [JCrypTool](/en/jct).