Key Revocation

Key revocation is the process of invalidating a cryptographic key before its scheduled expiration, usually because the key has been compromised or the user's authority has changed. In a secure system, it is vital to have a mechanism to inform all participants that a specific key should no longer be trusted.

If a private key is stolen, the owner must immediately revoke the associated public key to prevent an attacker from signing unauthorized transactions. This is often handled through Certificate Revocation Lists or online status protocols.

In decentralized systems, this can be more complex, as there is no central authority to manage revocation, often requiring smart contract-based solutions to disable compromised keys. Effective key revocation is a critical component of incident response in any secure financial environment.