Post-compromise security¶
Short definition¶
A session can regain confidentiality after temporary state theft and safe key evolution.
Concrete example¶
An attacker copies session state then loses access; fresh exchanges may renew protection.
What it protects¶
Some future exchanges after temporary compromise, depending on protocol.
What it does not protect¶
Does not repair a phone still controlled by spyware.
Why it matters¶
Distinguish cryptographic recovery from cleaning a device.
Technical details
The property depends on key exchanges, assumptions and implementation; it is not uniform across all clients.