Terminology Index
Glossary
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Forward Secrecy
A property of encrypted connections where compromising a server's long-term private key later does not let an attacker decrypt past sessions, because each session used a unique, ephemeral key that was never stored.
Forward secrecy (or perfect forward secrecy) ensures that recorded encrypted traffic stays protected even if the server's private key is stolen in the future. It is achieved with ephemeral key exchanges (like ephemeral Diffie-Hellman or ECDHE) that generate a fresh, throwaway key per session, so there is no master key whose compromise unlocks the past. It is a key property of modern TLS configurations.
Introduced in: Cryptography Essentials
Examples
- Past TLS sessions staying safe even after a server's private key is later stolen.
- Using ephemeral ECDHE key exchange to provide forward secrecy.
- Generating a unique session key that is discarded after the connection.
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