Exchanging public keys and signing them is still a complicated matter for normal users. As part of the development of FreedomBox we are thinking of a simple way to establish trust and enable two people talk to each other through secure cryptographic means.
One possible scenario is the following: User Jane meets her friend Ken, they ‘bump’ their phones or scan QRcode and by doing so they exchange not only their private information (vcard, GPG keys) but also establish a high degree of digital identity trust. The updated status of ‘trust’ can be then transmitted back from the phone to their respective FreedomBoxes, securing future communication between Jane and Ken.
I’ve asked for comments and asked for participants on the FreedomBox discuss mailing list. Read the conversation on the archives and consider joining the effort.