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I'm searching for the easiest free way to create a secure survey where users have to enter a password or something like it to identify theirselves, to avoid double voting and some kind of hack.

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There are a variety of third party services which might suit your needs; can you elaborate on what type of solutions you would consider acceptable? – danlefree♦ Jul 31 '12 at 15:50

closed as not constructive by RandomBen Jul 31 '12 at 17:16

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