Increase Phone PIN Security By Repeating a Digit

By Jason Fitzpatrick on January 3rd, 2012

If you’re looking for a simple way to increase the security of PIN passcodes on devices with touch screens you can do so by repeating a digit in the sequence.

Over at Tech Crunch they highlight a downside to touchscreen PIN interfaces and a way you can easily improve security. First the problem: if you use a four digit PIN with four unique numbers, your finger prints give you away. The marks left on the screen identify the buttons pressed and reduce the high number of combinations yielded from a 4 digit pin (10,000) to a very low number of combinations one can create with only 4 numbers (24).

The solution? By simply doubling up one of the digits (i.e. using the number 5 twice in the sequence like 5785) you increase the potential variants to 36. It’s a marginal increase to be sure but it introduces an additional challenge to someone snooping on your phone with absolute zero effort on your part.

Want to Make Your iPHone’s PIN More Secure? Repeat a Digit. [Tech Crunch]

Jason Fitzpatrick is a warranty-voiding DIYer who spends his days cracking opening cases and wrestling with code so you don't have to. If it can be modded, optimized, repurposed, or torn apart for fun he's interested (and probably already at the workbench taking it apart). You can follow him on if you'd like.

  • Published 01/3/12
More Articles You Might Like

Enter Your Email Here to Get Access for Free:

Go check your email!