"NFC interface and door
locks only operate within a narrow bandwidth and have limited computing
power. Consequently, scientists at the SIT have equipped ShareKey with
particularly resource-efficient communication protocols. Further,
electronic keys are reliably protected on the smartphone from malware
and unauthorized access.
This is achieved by leveraging advanced technologies which keep
sensitive data on the smartphone separate from other data and apps lik
Communication between the mobile phone and a central server is protected by established security protocols.
'And even if this communication is hacked into, it’s impossible for
unauthorized people to gain access to the digital key. This is because
opening the door requires information contained both in the encrypted
token sent to the user and in the app installed on their smartphone,'
I don't see any downside except if your smart phone battery goes dead.