Could you expand on this? How would I securely communicate from a device that, say, has a kernel level implant? This is one of those cases where SGX/TrustZone would be immensely helpful but nobody has built a messenger that actually somehow fully lives in an enclave.
If you assume every device you use is compromised, how can you possibly use any encryption?
If you assume every device you use is compromised, how can you possibly use any encryption?