Apple has published its 2021 update to its Platform Security guide today along with refreshing the Apple Platform Security landing page (spanish version, still from spring 2020).
The latest guide goes in-depth on the new and updated security features that have arrived with iOS 14, macOS 11 Big Sur, Apple Silicon Macs, watchOS 7, and more. Apple has also launched an all-new Security Certifications and Compliance Center website and guide.

Check out all the new topics added to the Apple Platform Security guide this year:
- Memory safe iBoot implementation
- Boot process for a Mac with Apple silicon
- Boot modes for a Mac with Apple silicon
- Startup Disk security policy control for a Mac with Apple silicon
- LocalPolicy signing-key creation and management
- Contents of a LocalPolicy file for a Mac with Apple silicon
- Signed system volume security in macOS
- Apple Security Research Device
- Password Monitoring
- IPv6 security
- Car keys security in iOS
And here are all the security topics that have been updated:
- Secure Enclave
- Hardware microphone disconnect
- recoveryOS and diagnostics environments for an Intel-based Mac
- Direct memory access protections for Mac computers
- Kernel extensions in macOS
- System Integrity Protection
- System security for watchOS
- Managing FileVault in macOS
- App access to saved passwords
- Password security recommendations
- Apple Cash security in iOS, iPadOS, and watchOS
- Secure Business Chat using the Messages app
- Wi-Fi privacy
- Activation Lock security
- Apple Configurator 2 security
Along with the updated Apple Platform Security guide, Apple has an all-new Security Certifications and Compliance Center.