Open Whisper system's Signal fingerprint verification is non-trivial
Channel: Kai Hendry
Date: 2015-08-04

Version 2.1.2

The verification process assumes you are in proximity with one another. I would feel more confident about it if it DID NOT USE my address book.

There is a number of related bugs open about it: https://github.com/WhisperSystems/Signal-iOS/issues?utf8=%E2%9C%93&q=is%3Aissue+is%3Aopen+fingerprint