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Userspace<br />
UserEventAgent<br />
Darwin lock/unlock<br />
Notifications<br />
SpringBoard<br />
MobileKeybag.framework<br />
1) pressing home button starts Touch ID sensor<br />
7) send unlock notification<br />
XNU (Kernel)<br />
AppleKeyStore<br />
SEP endpoint to SKS<br />
AppleMesa<br />
SEP endpoint to SBIO<br />
4) decrypt<br />
master key<br />
random secret<br />
master key<br />
SKS<br />
SBIO<br />
bio memory<br />
Touch ID<br />
Sensor<br />
2) template match sent to SBIO<br />
SEP<br />
master key<br />
random secret<br />
SKS memory<br />
master key + SEP UID<br />
class A<br />
class B (priv)<br />
class C<br />
SKS keyring<br />
class A<br />
class B (priv)<br />
class B (public)<br />
class C<br />
class D<br />
3) upon successful match send<br />
random secret to SKS<br />
6) securely destroy master key<br />
5) decrypt class keys, add to keyring<br />
Touch ID unlock
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