OpenSSL is a core library for cryptography and secure communications. Its separation of duties model enforces that critical operations are split across trusted roles. This reduces the attack surface. No single person or system can compromise the entire chain of trust.
In practical terms, separation of duties in OpenSSL means breaking the lifecycle of keys, certificates, and signatures into discrete responsibilities. Common patterns include:
- Key Generation: One role creates private keys using OpenSSL commands or APIs.
- Certificate Signing: A different role or system signs the keys into valid certificates, often in a secure, offline environment.
- Deployment: Another role deploys certificates to production systems.
- Revocation: A separate authority handles certificate revocation lists (CRLs) or online certificate status protocol (OCSP) responses.
This structure is not theory—it is enforced through process, access control, and infrastructure isolation. By aligning roles with unique privileges, OpenSSL deployments gain stronger resilience. Even if one account or host is breached, the damage is limited to its scope.