Copying the pre-built image to an SD card You can also verify the integrity of this web page by checking the PGP detached signature.įeedback is more than welcome. Please make sure you received the right file by checking the hash. If you prefer to use a pre-build image (last update: ), you can use: Needed to build your own image to write onto an SD card are available. The source code with all the sources to convert the content and the scripts Unplug the device and remove the USB keys: When the music stops, the conversion is finished. Otherwise, plug a headset and listen to the music that is played during the conversion. If you have a Raspberry Pi with a diode, wait until the blinking stops: The extractedĭocuments are sometimes bigger than the original ones. Note: Make sure your own key is bigger than the untrusted one. Plug your own, trusted key into the bottom usb slot: Plug the untrusted key into the top usb slot of the Raspberry Pi:
The visual instructions how to use CIRCLean is available in vertical PDF format and horizontal PDF format.
UsageĬIRCLean is designed to be used by everyone and the following visual shows how to use it in 8 easy steps. We also invite all organizations to actively reuse CIRCLean in their own products or contribute to the project.
CIRCLean is free software which can be audited and analyzed by third-parties. CIRCLean can be seen as a kind of air gap between the untrusted USB key and your operational computer.ĬIRCLean does not require any technical prerequisites of any kind and can be usedīy anyone. The code runs on a Raspberry Pi (a small hardware device), which also means it is not required to plug the original USB key into a computer. In the worst case, only the CIRCLean would be compromised, but not the computer reading the target (trusted) USB key/stick. The focus of CIRCLean is to establish document exchange even if the used transport layer (the USB stick) cannot be trusted or if there is a suspicion about whether the contained documents are free of malware or not. The device automatically converts untrusted documents into a readable but disarmed format and stores these clean files on a trusted (user owned) USB key/stick. Malware regularly uses USB sticks to infect victims, and the abuse of USB sticks is a common vector of infection (as an example Lost USB keys have 66% chance of malware).ĬIRCLean is an independent hardware solution to clean documents from untrusted (obtained) USB keys / USB sticks.