"Signal is Expensive”, from CEO @Mer__edith, is very good. The transparency around infrastructure costs had me hooked from the start, but the ways they've rearchitected ubiquitous features (profile pictures, GIF sharing, finding contacts) to protect user privacy, that’s really stunning.
Example: I had absolutely no optimism that anyone implemented contact discovery without, uh, storing all my contacts. And here Signal has been doing it all along?
This should be the norm. An OS-level feature, even. Tremendous dedication by the Signal team.
@donmccurdy @techghoul
How does this work though?
@JoshuaACNewman @donmccurdy @techghoul
It trusts SGX: https://signal.org/blog/private-contact-discovery/
So, it is sending contact lists in such a way that they cannot be extracted without a collusion between Signal and Intel.
