Obfuscated reversible circuits can do CCA2 encryption, and even leak into FE/HE territory if you squint hard enough.

Black-box PIR with preprocessing gets lower bounds for free, sublinear online work still buys you linear-ish comms or server crypto.

Vitalik’s Part I walks through modern iO from FE to lattices, a recursive stack that’s still miles from practical obfuscation.

A writeup on system-prompt extraction attacks, scoring, and defenses, with leakage varying by model, because secrets are optional.

A circuit-level one-shot signature scheme with classical public keys and quantum secret keys, plus the qubit/gate count.