"iCloud Password" Dialog
Sanity Check: Is this legitimate?
Mac Pro, OS X Mavericks (10.9.3), 8x2.8GHz, 2560x1600 Cinema HD
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If that is your e-mail address it is probably legitimate.
Delete the password from Keychain Access (Applications/Utilities). While there, Keychain Access menu First Aid.
Keychain Issues - Resolve see post by Kappy