Signal, the encrypted instant messaging and voice calling app for Android and iOS, has passed a security audit by the International Association for Cryptologic Research with flying colours. Five researchers from the UK, Australia and Canada subjected Signal to a rigorous workout, and have found that its cryptographic core stands up well to threat models.
In fact, so good was Signal’s security architecture that the team had some difficulty testing it. They did pass on a couple of suggested improvements, but overall gave it the thumbs up. However, this was only one aspect of Signal’s operations, so constitutes a promising start rather than a positive endorsement across the board. Still, for those who are paying increasingly close attention to their privacy, Signal is likely to remain the preferred messaging app for some time to come.