Why are pins required on boot on devices with fingerprint readers? [duplicate]












2















This question already has an answer here:




  • Why do mobile devices force user to type password after reboot?

    4 answers




Both my iPad and my android phone are configured to allow access via either a pin, or a fingerprint scan. However, immediately after a reboot, neither device allows a fingerprint for the first unlock; the pin is required instead. Both devices state "a pin is required to unlock after a reboot".



Why is this? What risk is associated with allowing a fingerprint unlock directly after a power on?










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marked as duplicate by forest, Community yesterday


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.











  • 1




    I just found this duplicate. The answer explains why this is the case even with fingerprint readers.
    – forest
    yesterday
















2















This question already has an answer here:




  • Why do mobile devices force user to type password after reboot?

    4 answers




Both my iPad and my android phone are configured to allow access via either a pin, or a fingerprint scan. However, immediately after a reboot, neither device allows a fingerprint for the first unlock; the pin is required instead. Both devices state "a pin is required to unlock after a reboot".



Why is this? What risk is associated with allowing a fingerprint unlock directly after a power on?










share|improve this question















marked as duplicate by forest, Community yesterday


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.











  • 1




    I just found this duplicate. The answer explains why this is the case even with fingerprint readers.
    – forest
    yesterday














2












2








2


1






This question already has an answer here:




  • Why do mobile devices force user to type password after reboot?

    4 answers




Both my iPad and my android phone are configured to allow access via either a pin, or a fingerprint scan. However, immediately after a reboot, neither device allows a fingerprint for the first unlock; the pin is required instead. Both devices state "a pin is required to unlock after a reboot".



Why is this? What risk is associated with allowing a fingerprint unlock directly after a power on?










share|improve this question
















This question already has an answer here:




  • Why do mobile devices force user to type password after reboot?

    4 answers




Both my iPad and my android phone are configured to allow access via either a pin, or a fingerprint scan. However, immediately after a reboot, neither device allows a fingerprint for the first unlock; the pin is required instead. Both devices state "a pin is required to unlock after a reboot".



Why is this? What risk is associated with allowing a fingerprint unlock directly after a power on?





This question already has an answer here:




  • Why do mobile devices force user to type password after reboot?

    4 answers








authentication biometrics boot






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edited yesterday









forest

33.2k16106114




33.2k16106114










asked yesterday









Jason CJason C

187114




187114




marked as duplicate by forest, Community yesterday


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.






marked as duplicate by forest, Community yesterday


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.










  • 1




    I just found this duplicate. The answer explains why this is the case even with fingerprint readers.
    – forest
    yesterday














  • 1




    I just found this duplicate. The answer explains why this is the case even with fingerprint readers.
    – forest
    yesterday








1




1




I just found this duplicate. The answer explains why this is the case even with fingerprint readers.
– forest
yesterday




I just found this duplicate. The answer explains why this is the case even with fingerprint readers.
– forest
yesterday










1 Answer
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The PIN is used to derive an encryption key, whereas the fingerprint is used only for authentication. Because the encryption key is kept in memory during runtime, it is lost after a reboot and needs to be supplied again. It is supplied via the PIN or passphrase that you are required to enter.






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    1 Answer
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    active

    oldest

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    1 Answer
    1






    active

    oldest

    votes









    active

    oldest

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    active

    oldest

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    5














    The PIN is used to derive an encryption key, whereas the fingerprint is used only for authentication. Because the encryption key is kept in memory during runtime, it is lost after a reboot and needs to be supplied again. It is supplied via the PIN or passphrase that you are required to enter.






    share|improve this answer


























      5














      The PIN is used to derive an encryption key, whereas the fingerprint is used only for authentication. Because the encryption key is kept in memory during runtime, it is lost after a reboot and needs to be supplied again. It is supplied via the PIN or passphrase that you are required to enter.






      share|improve this answer
























        5












        5








        5






        The PIN is used to derive an encryption key, whereas the fingerprint is used only for authentication. Because the encryption key is kept in memory during runtime, it is lost after a reboot and needs to be supplied again. It is supplied via the PIN or passphrase that you are required to enter.






        share|improve this answer












        The PIN is used to derive an encryption key, whereas the fingerprint is used only for authentication. Because the encryption key is kept in memory during runtime, it is lost after a reboot and needs to be supplied again. It is supplied via the PIN or passphrase that you are required to enter.







        share|improve this answer












        share|improve this answer



        share|improve this answer










        answered yesterday









        forestforest

        33.2k16106114




        33.2k16106114















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