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Behind the Scenes with iOS Security

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Userspace<br />

UserEventAgent<br />

Darwin lock/unlock<br />

Notifications<br />

1) device locks<br />

SpringBoard<br />

MobileKeybag.framework<br />

3) send lock notification<br />

XNU (Kernel)<br />

AppleKeyStore<br />

SEP Endpoint to SKS<br />

SEP<br />

SKS<br />

2) purge class A and class B priv keys<br />

SKS keyring<br />

class B (public)<br />

class C<br />

class D<br />

SKS memory<br />

master key + SEP UID<br />

class A<br />

class B (priv)<br />

class C<br />

lock

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