Forward Secrecy
Definition
Forward secrecy (also called perfect forward secrecy) is a property of secure communication protocols ensuring that session keys cannot be compromised even if long-term private keys are later exposed. Each session uses unique ephemeral keys that are deleted after use, protecting historical communications.
Technical Explanation
Without forward secrecy, an attacker who records encrypted traffic and later obtains the server's private key can decrypt all historical sessions. Forward secrecy prevents this by generating unique session keys through ephemeral key exchange. The long-term key only authenticates parties; it never directly encrypts data.
Post-quantum forward secrecy requires using quantum-resistant algorithms for ephemeral key exchange. Classical Diffie-Hellman is vulnerable to quantum attacks, so quantum-safe protocols use Kyber or other post-quantum KEMs to establish ephemeral shared secrets.
SynX Relevance
SynX implements quantum-safe forward secrecy using ephemeral Kyber-768 key exchange. This means recorded SynX network traffic will remain confidential forever—even if future quantum computers break classical cryptography or if any long-term keys are somehow compromised.
Frequently Asked Questions
- Why is forward secrecy important for cryptocurrency?
- It prevents harvest-now-decrypt-later attacks from revealing transaction details or private data.
- Does SynX use forward secrecy for all connections?
- Yes, every wallet-to-daemon connection establishes fresh ephemeral keys.
- Can quantum computers break forward secrecy?
- Not if quantum-resistant algorithms like Kyber are used for ephemeral key exchange.
Your data stays private forever. Experience SynX forward secrecy