Fingerprint delete on iphone 5S when selling

Discussion in 'iPhone' started by GuywithMacs, Mar 4, 2015.

  1. GuywithMacs macrumors newbie

    Nov 22, 2014
    I maybe paranoid, but this is a genuine concern (Some of you might be wondering the same thing). I've used my fingerprint for the Touch ID, Now I'm about to upgrade my 5S and buy a 6, how safe is it just by doing Settings -> erase all content and settings?

    Apple says that is enough to scramble data before selling it.

    Im just paranoid that someone can extract the fingerprint and use it in malicious ways.
  2. JayLenochiniMac macrumors G5

    Nov 7, 2007
    New Sanfrakota
    Don't worry, the TouchID data are just a bunch of data points and do not resemble your actual fingerprint. They cannot be reverse-engineered to reveal your print even if you don't delete it.
  3. sunking101 macrumors 604


    Sep 19, 2013
    I bet they can. Nothing is safe if the right (wrong) person gets involved IMO.
  4. JayLenochiniMac macrumors G5

    Nov 7, 2007
    New Sanfrakota
    No, stop spreading false information. The actual fingerprint is never stored and cannot be reverse engineered from TouchID data points.
  5. Woochifer macrumors 6502a

    Apr 22, 2007
    The most important thing is to sign out of your Apple ID before you deactivate the phone.

    You can also go a step further by setting up the phone as a new device and removing the SIM card before selling it. This will wipe everything off the phone, including anything associated with your Apple ID and mobile account. And it will reinstall iOS as well.

    As JayLenochiniMac posted, the fingerprint scans are not stored anywhere on the device. The stored data points cannot be used to reconstruct the fingerprints. Apple's security white paper goes into detail about how iOS is secured in general, and has full data encryption enabled by default.

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