JonDo is a free, open-source and highly portable (Java-based) client software for accessing the JonDonym services. Its primary use is the anonymisation of web site requests against web site operators, internet providers and the anonymisation service Operators.

All requests of the web browser have to be processed by the JonDo program instead of accessing the internet directly. JonDo encrypts the data and sends it to the first Mix of a Mix Cascade. The first Mix then mixes the data with that of other users and sends it to the second mix station which passes it on to the third mix station which decrypts and sends the data through a cache proxy to the internet.

Each mix carries out cryptographic operations on the message so that the JonDo-encrypted data is only readable after having passed through the proper mixes in the proper order. This ensures that an eavesdropper either only receives unreadable (encrypted) data or can no longer determine the sender. In order for it to work correctly, only one mix in the cascade needs be trusted not to inform the eavesdropper about the method of message mixing. The more users that use the cascade, the harder it is for an observer to distinguish single users.

Why use JonDo?:

Secure Surfing:
At public data networks and wireless local area networks (Wi-Fi hotspots, cyber cafés, hotels, airports etc.) hackers can easily spy out and manipulate personal data and keywords. JonDonym protects

Informational self-determination:
As a result of government requirements more and more personal data is legally saved. JonDonym gives back privacy.

Free access to information:
In many countries, e.g. China, access to information is limited by censorship. JonDonym overcomes limits.

Freedom of expression:
Due to fear of repression people mind publishing their opinion, for example in blogs. JonDonym gives them back their voice.

How it works:
Instead of connecting directly to a webserver, users take a detour, connecting with encryption through several intermediaries, so-called mixes. 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.

JonDo 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.

Requirements:
OS X 10.9+
Intel

Also available is:
Version for Mac OS 7.6.1 -- Mac OS 9 and Classic