## Information Leakage from Keypads

Can anyone guess the entry codes for these door locks?

There are 10,000 possible four-digit codes, but you only have to try 24 on these keypads. The first is most likely 1986 or 1968. The second is almost certainly 1234.

Joel F • July 2, 2009 12:39 PM

The first may have few possibilities, but I would start with 1968, followed by 1986.