I was talking to Moxie's cofounder, Joshua Goldbard, the other month about this. They strongly depend upon secure enclaves to achieve it.<p>It seems like a rather clever use of DMCA related technology, potentially backfiring in the DMCA's face if it is extended to other use cases.<p>However, using secure enclaves seems like chasing a fading rainbow. The tech doesn't work without trusting the enclave, yet if we trust it, we're re-centralized our trust in chip makers like Intel.<p>Or worse, if it works extraordinarily well, I'm afraid DMCA related gangs will figure out how to lawyer those use cases out of existence in the same way they lawyer-ed in the tech to begin with.<p>I'm glad Moxie & co. are trying though, somebody has to! I have been previously very skeptical about the claims made by Signal, though, but as long as the enclave works, then they seem to hold true.