Apple Platform Security
- Welcome
 - Intro to Apple platform security
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- System security overview
 - Signed system volume security
 - Secure software updates
 - Rapid Security Responses
 - Operating system integrity
 - BlastDoor for Messages and IDS
 - Lockdown Mode security
 - System security for watchOS
 - Random number generation
 - Apple Security Research Device
 
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- Services security overview
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- Apple Pay security overview
 - Apple Pay component security
 - How Apple Pay keeps users’ purchases protected
 - Payment authorization with Apple Pay
 - Paying with cards using Apple Pay
 - Contactless passes in Apple Pay
 - Rendering cards unusable with Apple Pay
 - Apple Card security
 - Apple Cash security
 - Tap to Pay on iPhone
 
 - Secure Apple Messages for Business
 - FaceTime security
 
 - Glossary
 - Document revision history
 - Copyright
 

Firewall security in macOS
macOS includes a built-in firewall to protect the Mac from network access and denial-of-service attacks. It can be configured by going to System Settings > Privacy & Security (macOS 13 or later), the Security & Privacy pane of System Preferences (macOS 12 or earlier), or by using a configuration profile with the Firewall payload installed manually or provided by an MDM solution. The following configurations are supported:
Block all incoming connections, regardless of app.
Automatically allow built-in software to receive incoming connections.
Automatically allow downloaded and signed software to receive incoming connections.
Add or deny access based on user-specified apps.
Prevent the Mac from responding to ICMP (Internet Control Message Protocol) probing and portscan requests.