This site is set up for testing U2F devices, and U2F authentication using Perl/Plack.
The data you send (specifically, the U2F data your device sends) will be stored for later analysis.
The username and password data will be stored in-memory and transiently, as clear-text.
DO NOT USE "REAL WORLD" DATA IN THIS SYSTEM!
DO NOT USE REAL CREDENTIALS!
The "username" field DISALLOWS email addresses.
The "password" field allows a maximum of FOUR characters. Yes, FOUR. It's THAT insecure.
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