Apple Platform Security
- Welcome
- Intro to Apple platform security
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- Encryption and Data Protection overview
- Passcodes and passwords
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- Data Protection overview
- Data Protection
- Data Protection classes
- Keybags for Data Protection
- Protecting keys in alternate boot modes
- Protecting user data in the face of attack
- Sealed Key Protection (SKP)
- Activating data connections securely in iOS and iPadOS
- Role of Apple File System
- Keychain data protection
- Digital signing and encryption
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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 authorisation 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

iPhone Text Message Forwarding security
Text Message Forwarding automatically sends SMS text messages received on an iPhone to a user’s enrolled iPad, iPod touch or Mac. Each device must be signed into the iMessage service using the same Apple ID account. When Text Message Forwarding is turned on, enrolment is automatic on devices within a user’s circle of trust if two-factor authentication is enabled. Otherwise, enrolment is verified on each device by entering a random six-digit numeric code generated by iPhone.
After devices are linked, iPhone encrypts and forwards incoming SMS text messages to each device utilising the methods described in iMessage security overview. Replies are sent back to iPhone using the same method and then iPhone sends the reply as a text message using the carrier’s SMS transmission mechanism. Text Message Forwarding can be turned on or off in Messages settings.