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System security service — manages code signing, certificates, and keychain access

Handles code signing validation, certificate verification, and keychain authentication for system processes and applications. Communicates directly with hardware and security subsystems to enforce code execution policies and manage cryptographic credentials. Exposes two XPC services for clients to request signing and authentication operations. Maintains network connectivity to Apple endpoints for certificate validation and revocation checking, and reports telemetry on security events back to Apple.AI