JAP – JonDo Anonymity Proxy

Without Anonymization, every computer in the internet communicates using a traceable Address. That means:

  • the website visited,
  • the internet service provider (ISP),
  • and any eavesdropper on the internet connection

can determine which websites the user of a specific computer visits. Even the information which the user calls up can be intercepted and seen if encryption is not used. JAP uses a single static address which is shared by many JAP users. That way neither the visited website, nor an eavesdropper can determine which user visited which website.

How it works

Instead of connecting directly to a webserver, users take a detour, connecting with encryption through several intermediaries, so-called Mixes. JAP uses a predetermined sequence for the mixes. Such a sequence of linked mixes is called a Mix Cascade. Users can choose between different mix cascades.

Since many users use these intermediaries at the same time, the internet connection of any one single user is hidden among the connections of all the other users. No one, not anyone from outside, not any of the other users, not even the provider of the intermediary service can determine which connection belongs to which user. A relationship between a connection and its user could only be determined if all intermediaries worked together to sabotage the anonymization.

The intermediaries (mix providers) are generally provided by independent institutions which officially declare, that they do not keep connection log files or exchange such data with other mix providers. JAP shows the identity and number of organisations in each Mix cascade in detail, and verifies this information by cryptographic means. The users are thus able to selectively choose trustable mix cascades. independent watchdogs, who work in the name of the JAP users, will insure that the mix providers hold to their official declarations.

Download JAP

Attention! The first release of JAP is downloadable free of charge and already protects your privacy against most observers like your ISP, your network operator, or your boss. However, this version does not yet achieve the full security and anonymity that we strive for. It does not protect you against an adversary who has the capability to observe all communication links on the Internet. If you’d like to be informed about newer versions and other important changes to JAP, please subscribe to our mailing lists. Please choose your operating system:

  • Windows 95/98/ME/NT/2000/XP
  • Apple Macintosh
  • OS/2
  • Others (especially Unix/Linux)

Help and FAQ

Help is available Online or can be downloaded as a PDF Document. If you still have questions, take a look at the FAQ (Frequently Asked Questions).


Information about JAP development is available on our developer pages. Here you will find the newest source codes from JAP, mixes, and Infoservice. You can submit a developer pages. Here you will find the newest source codes from JAP, mixes, and Infoservice. You can submit a bug report or join the mailing list or discussion forum.


Do you have suggestions, comments, criticisms? Please take part in our Questionnaire.

Outages and maintenance times

We cannot guarantee our services (mixes, infoservice, website, download, etc.) and would like to apologize for any inconvenience caused due to system down time.

  • Because JAP is a research project, it is continuously being further developed. Nevertheless, we attempt to offer a stable, downloadable version at all times, and to keep the service available.
  • Monday, 2:00PM – 4:00PM (CEST)
  • Wednesday, 2:00PM – 4:00PM (CEST)

That is Central European Standard Time. Subtract 6 hours to get Eastern Standard Time (EST).–>

  • At the moment, the web servers and infoservices are run by universities and other public infrastructures and are free of charge for the user (even though a lot of extra data traffic is produced). Unfortunately, power supplies or data networks sometimes fail or are switched off for maintenance. We will try to keep you informed in the ‘News’ column on this website about planned maintenance but in case of an unforeseen failure in the university network, we are powerless.
  • Mixes and Mix Cascades, respectively, are operated by external organisations, which are independent from the project itself. We may inform the operators about outages, but we are unable to correct Mix failures ourselves, and typically cannot find the cause, either.
  • ==============================================

    Name User Traffic Mixed Packets
    JonDos Test Mix 25 32 20,252,097
    Forseti II.-JAP 470 57 7,620,625
    Dresden-Dresden 2866 67 3,226,743,045
    SpeedPartner-GPF 706 47 27,251,831
    Diderot-Lilie-Jupiter 22 35 11,800,766
    Pythagoras-Tulpe-Saturn 25 100 15,035,846
    Apfel-Rousseau-Augenklappe 32 19 27,387,629
    Zeitwort-Westermann-JonDos 15 41 5,571,409
    Amun-Pluto-Euler 70 100 82,609,631
    SpeedPartner-ULD 258 69 1,856,929
    Euklid-Rose-ExarKun 23 96 8,076,675

    URL : http://anon.inf.tu-dresden.de/index_en.html
    Download : http://anon.inf.tu-dresden.de/download_en.html
    Install Requerement : JRE
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