Alistair wrote:
Most people use a classical 4-digit pin number to protect their device (longer passwords are harder to remember, and also a hindrance to usability according to casual users), this comes down to brute forcing only 10,000 possible combinations which is trivial for a computer to process.
If I may, if you lock the phone after three (or five) failed attempts (just like the PIN does and then you need the PUK), even a 4 digit may do.
I may state the obvious <img src="images/smiles/icon_confused.gif" alt="Confused" title="Confused" /> , but for smartphones a combination of facial recognition AND PIN might be an option.
Facial recognition alone, doubtly so:
http://kgmacke.hubpages.com/hub/Beware-of-the-Ice-Cream-Sandwich-the-marketing-ploy-of-face-recognition
jaclaz
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