Using only password to authenticate user (no "username" field)

Posted by Guy on Pro Webmasters See other posts from Pro Webmasters or by Guy
Published on 2012-06-02T09:14:40Z Indexed on 2012/06/02 10:51 UTC
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authentication

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user-friendly

I am creating a client access system, to allow manage invoices, make payments, access information about their products and information/functionality alike.

Supposedly there are less than 1000 clients. Would there be any security threat to use only password (UUID v4 strings) to authenticate user?

My thoughts:

There is virtually no probability of collision or success with brute-force attack. http://en.wikipedia.org/wiki/UUID#Random%5FUUID%5Fprobability%5Fof%5Fduplicates
User friendly (one click go)
It is not intended to be remembered

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