Security

NFC

As previously described the NFC Technology will be used as the way the exchange the keys. To use this method both Users need to have the App opened with the NFC Component. One of these Users needs to Initiate the Exchange by Pressing the Button. It is important that just ONE! of the Users has to press the Button. This Exchange is bi-directional so both will send their key and all the Signatures they created themselves. We set that Signature can only be created by receiving the Key during an Exchange using NFC. So our Chain of Trust will be quite short.

PKI

All the Signatures we retrieved during the NFC Exchange are displayed withing the PKI Component. There will be a list of all Signatures. Each Entry will display how long this Signature is still valid, how many Users have signed it and if we signed it ourselves.