I want to make an App that allows secure File Transfers between phones.
The Gimmick IS that the File when being sent is deleted from the source Phone and Not duplicated in the process.
I thought about a qr Code in the sending Phone that IS scanned by the Receiver AND tthen nfc communicarion IS established between the phones.
This IS basically trying to solve the Double spending Problem when using files offline.
Possible problems could be:
Sender using a Fake App.
Eavesdroppers on the nfc Transfer.
File in source Phone Not being Marked as sent once Transfer IS complere.
1. Show qr Code to give Access rights to File
2. Second Phone Scans it. ITS an encoded Filename AND Access rights key.
3. Nfc secure Channel IS established.
4. Leecher Phone locks the File, thus establishing a Transaction.
5. File ist being transferred.
6. In completion the File is deleted on source device, maybe giving a uniquw delwtion receipt which validates the transferred Data as unique AND spent. Once.
Thoughts AND suggestions pleased.