# Simple Maths Question

**URL:** <https://boards.straightdope.com/t/simple-maths-question/668836>\
**Category:** Factual Questions\
**Created:** [September 14, 2013, 10:47am UTC](https://boards.straightdope.com/t/simple-maths-question/668836 "2013-09-14T10:47:36Z")\
**Posts on this page:** 1\
**Showing post:** 12

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**Author:** ![pulykamell](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/pulykamell/32/3166_2.png) [@pulykamell](https://boards.straightdope.com/u/pulykamell)\
**Post date:** [September 14, 2013, 7:36pm UTC](https://boards.straightdope.com/t/simple-maths-question/668836/12 "2013-09-14T19:36:42Z")

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I dunno…this seems like a stupid system to me. Each key, only once, and any order? A thief could probably just look at the keypad and see which keys either: a) show signs of wear or b) have grease/oil on them. Just a little talc and it should be fairly trivial to figure out which keys are being punched in.

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