There are several good thoughts in this post:

    One easy improvement: Make it "real two factor" by allowing users to
    require a PIN/Password in addition to the fingerprint. Could they
    have done better then a fingerprint? There are a few different
    common biometric sensors: Facial recognition, Fingerprint,
    Weight/Height, retina scans and iris scans. Fingerprints are
    probably best considering the price of the sensor and the difficulty
    to acquire the data.

    Finally: There is probably one real big vulnerability here. A stolen
    iPhone is likely covered in the user's fingerprints. It shouldn't be
    too hard for an attacker to lift a finger print off the phone itself
    to bypass the sensor.

  via [1]ISC Diary | In Defense of Biometrics.

  I hope that Apple offers more details about how the fingerprint reader
  works. The technology exists to deal with the latent fingerprint issue.
  Many corporations will want true two-factor before relying on the
  iPhone's biometrics in the enterprise.

  If this is strong & robust authentication I hope Apple makes it
  available to other manufacturers as an open standard.
    __________________________________________________________________

  My original entry is here: [2]ISC Diary | In Defense of Biometrics. It
  posted Thu, 12 Sep 2013 16:00:06 +0000.
  Filed under: technology, InfoSec,

References

  1. https://isc.sans.edu/diary/In+Defense+of+Biometrics/16553
  2. https://www.prjorgensen.com/2013/09/12/isc-diary-in-defense-of-biometrics/