TouchID: Difference between revisions

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Apple has embedded a fingerprint sensor into the iPhone 5s's Home Button as a way to bypass the lock screen's passcode. This is Touch ID.
'''Touch ID''' is Apple's name for its fingerprint sensor technology in the iPhone 5s (and higher) home button, an alternative to typing in a lock screen passcode. See also: [http://theiphonewiki.com/w/index.php?title=Touch_ID Touch ID on TheiPhoneWiki].


All fingerprint information is encrypted and stored in the A7 chip. Touch ID it does stores "mathematical representation" of fingerprints.  
All fingerprint information is encrypted and stored in the A7 chip. TouchID stores "mathematical representation" of fingerprints.  


The iPhone 5s has an advanced security architecture called the Secure Enclave - within the A7 chip that protects and verifies fingerprint matches. Apple said the Secure Enclave is "walled off from the rest of A7 and as well as the rest of iOS", meaning only Touch ID has access to fingerprint data.  
The iPhone 5s has a security architecture called Secure Enclave within the A7 chip, which protects and verifies fingerprint matches. Apple said the Secure Enclave is "walled off from the rest of A7 and as well as the rest of iOS", meaning only Touch ID has access to fingerprint data.  


TouchID has 4 header files:  
TouchID has 4 header files (which can all be found at [http://developer.limneos.net/ developer.limneos.net]):
                                          PSBiometricIdentity.h  
PSBiometricIdentity.h  
                                          SBUIBiometricEventMonitor.h
SBUIBiometricEventMonitor.h
                                          SBUIBiometricEventObserver.h
SBUIBiometricEventObserver.h
                                          BiometricKitDelegate.h
BiometricKitDelegate.h


Which can all be found at: developer.limneos.net.
The main class is BiometricKit, which is a singleton class (+manager).


The PSBiometricIdentity.h is responsible for the settings of TouchID which can be found in settings >General > TouchId & Passcode > Touch ID. The 2 SpringBoardUIServices headers are responsible for scanning and detecting the finger on the lock screen; they use the delegate methods to for example match the finger like in the -(void)matchResult:(id)arg1; method.  
<code>PSBiometricIdentity.h</code> is responsible for the settings of TouchID, which can be found in Settings > General > Touch ID & Passcode > Touch ID. The two SpringBoardUIServices headers are responsible for scanning and detecting the finger on the lock screen; they use the delegate methods to, for example, match the finger such as in the <code>-(void)matchResult:(id)arg1;</code> method.  


If you log the argument of that method you will get something around the lines of:   -[<SBUIBiometricEventMonitor: 0x17867c3c0> matchResult:<BiometricKitIdentity: 0x1782562f0>] .
If you log the argument of that method, you will get something around the lines of: <code>-[<SBUIBiometricEventMonitor: 0x17867c3c0> matchResult:<BiometricKitIdentity: 0x1782562f0>]</code> . That <code><BiometricKitIdentity: 0x1782562f0></code> is the name of the finger that was just scanned and verified. We know from Apple that Touch ID is stored on the A7 processor chip inside the 5s in a secure enclave. What do we not know? How much storage is their in this secure enclave? Is it variable?
That <BiometricKitIdentity: 0x1782562f0> is the name of the finger that was just scanned and verified. Now we know from Apple that Touch ID is stored on the A7 Processor chip inside the 5s in a secure enclave. What do we not know? How much storage is their in this secure enclave? Is it variable?...


''REFERENCES:'''
== Detecting taps ==


http://www.pocket-lint.com/news/123832-apple-s-touch-id-fingerprint-sensor-explained-here-s-what-you-need-to-know
You can detect taps using methods found in SBReachabilityTrigger.h
 
== BiometricKit.framework ==
{{ main|BiometricKit.framework }}
 
== References ==
 
#http://www.pocket-lint.com/news/123832-apple-s-touch-id-fingerprint-sensor-explained-here-s-what-you-need-to-know

Latest revision as of 22:52, 30 December 2014

Touch ID is Apple's name for its fingerprint sensor technology in the iPhone 5s (and higher) home button, an alternative to typing in a lock screen passcode. See also: Touch ID on TheiPhoneWiki.

All fingerprint information is encrypted and stored in the A7 chip. TouchID stores "mathematical representation" of fingerprints.

The iPhone 5s has a security architecture called Secure Enclave within the A7 chip, which protects and verifies fingerprint matches. Apple said the Secure Enclave is "walled off from the rest of A7 and as well as the rest of iOS", meaning only Touch ID has access to fingerprint data.

TouchID has 4 header files (which can all be found at developer.limneos.net):

PSBiometricIdentity.h 
SBUIBiometricEventMonitor.h
SBUIBiometricEventObserver.h
BiometricKitDelegate.h

The main class is BiometricKit, which is a singleton class (+manager).

PSBiometricIdentity.h is responsible for the settings of TouchID, which can be found in Settings > General > Touch ID & Passcode > Touch ID. The two SpringBoardUIServices headers are responsible for scanning and detecting the finger on the lock screen; they use the delegate methods to, for example, match the finger such as in the -(void)matchResult:(id)arg1; method.

If you log the argument of that method, you will get something around the lines of: -[<SBUIBiometricEventMonitor: 0x17867c3c0> matchResult:<BiometricKitIdentity: 0x1782562f0>] . That <BiometricKitIdentity: 0x1782562f0> is the name of the finger that was just scanned and verified. We know from Apple that Touch ID is stored on the A7 processor chip inside the 5s in a secure enclave. What do we not know? How much storage is their in this secure enclave? Is it variable?

Detecting taps

You can detect taps using methods found in SBReachabilityTrigger.h

BiometricKit.framework

References

  1. http://www.pocket-lint.com/news/123832-apple-s-touch-id-fingerprint-sensor-explained-here-s-what-you-need-to-know