2011-06-16

15% use one of these 10 iPhone passcodes

Someone making an iPhone lock screen app with a 4-digit passcode anonymously logged the passcodes. That led to the removal of his app from the app store. The app is called “Big Brother”, which to me sounds like a giveaway for what it does. The author now lists the 10 most commonly used codes in a a blog post. [Source: Marco Arment]

The top ten passcodes are as follows:

  1. 1234: 4.3%
  2. 0000: 2.6%
  3. 2580: 2.3%
  4. 1111: 1.6%
  5. 5555: 0.9%
  6. 5683: 0.7%
  7. 0852: 0.6%
  8. 2222: 0.6%
  9. 1212: 0.5%
  10. 1998: 0.4%
Great summary at the end of the post:
Formulaic passwords are never a good idea, yet 15% of all passcode sets were represented by only 10 different passcodes (out of a possible 10,000). The implication? A thief (or just a prankster) could safely try 10 different passcodes on your iPhone without initiating the data wipe. With a 15% success rate, about 1 in 7 iPhones would easily unlock—even more if the intruder knows the users’ years of birth, relationship status, etc.

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