jquery – simple javascript keystroke count

I\’m developing an online study/survey where I need to count the number of keystrokes that a participant makes. I am asking them to type lrlrlrlrlrlrl… in a text field to simulate walking. Turns out many of the participants (as evidenced by the time spent on the task) are copying and pasting.

I need something that will count keystrokes so I can identify participants who completed the task as requested. The study is programmed in Coldfusion and I was thinking about some sort of javascript/onkeydown/hidden file field combination, but I am not really a programmer.

Any help would be appreciated. Thanks.

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