It was only after Dan Shumow and Niels Ferguson's 2007 presentation that the potential for a backdoor became widely known.
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The general cryptographic community was initially not aware of the potential backdoor, until of Dan Shumow and Niels Ferguson 2007 rediscovery, or of Certicom's Daniel R. L. Brown and Scott Vanstone's 2005 patent application describing the backdoor mechanism.
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