What is securityd?

securityd is one of the most important security processes on your Mac. It is always running.

What is securityd?

It is the core security daemon for macOS. It looks after the Keychain, the encrypted store where your Mac keeps passwords, certificates, encryption keys, and other private data. It also checks code signatures and handles cryptographic work.

What does it manage?

• Keychain access: storing and fetching passwords, certificates, and keys
• Code signing: checking that apps are properly signed by their developers
• Cryptography: encrypting, decrypting, and hashing data
• Certificates: checking certificate chains and trust
• Authorisation: working with the authorisation system for privilege requests

Why is it always running?

Almost everything on your Mac touches the security system. Every app launch needs a code signature check. Every saved password needs the Keychain. Every secure web connection needs certificate checks. securityd handles all of this.

What about securityd.system?

securityd.system is the system-level version. While securityd handles security in your user account, securityd.system manages system-wide security: the System Keychain, root certificates, and tasks not tied to any single user.

Does it use many resources?

Normally, very few. If you see high processor use, it could mean:

• A large number of Keychain lookups (for example, moving many passwords)
• Certificate checking problems
• An app reading the Keychain over and over

Can you turn it off?

No. securityd is essential. Without it, no app could launch (code signatures could not be checked), no passwords could be fetched, and no secure connections could be made.

Should you worry?

No. It is the backbone of macOS security. It guards your passwords, checks your apps, and keeps connections secure.

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