Keypad Security Timer
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Some keypad security devices compare the last digits entered with their stored digit key sequence. Entering all possible sequences as a de Bruijn sequence requires typing characters.
Contributed by: Michael Schreiber (March 2011)
Open content licensed under CC BY-NC-SA
The timing assumes that entering one charcter takes one second.
"Keypad Security Timer"
Wolfram Demonstrations Project
Published: March 7 2011