Even then, AMD, Intel and now Apple CPU chips are suspected to be backdored. NIST has been slow to adapt a standard post-quantun E2EE algorithm, with some rumours of self-sabotage mandated by NSA (like they have already done in the past). The Tor network is extremely vulnerable to traffic correlation by big parties.
Encryption theoretically gives you what you describe, but in reality you still need to put a lot of thrust in things like your own hardware.