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iOS Encryption & Data Protection

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Secure Enclave
Encrypted Data Storage
​https://support.apple.com/guide/security/how-data-files-are-created-and-protected-sece8608431d/web​
Keychain
Access Control
Data Protection Classes
Keybags
​https://support.apple.com/guide/security/aside/sec8e00e0dd8/1/web/1​
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Securityd
Passcode
Used for entropy 
Hardware-based Rate-limit enforced by the Secure Enclave
Tangling algorithm PBKDF2. UID is pseudorandom function (PRF)
​https://support.apple.com/guide/security/passcodes-sec20230a10d/web 
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