Defense picks two for PKI
That might be feasible for land-based sites, said John Hines, director of Tumbleweed's validation authority product development, but it's practically impossible for ships at sea, where users share relatively low-bandwidth pipes.
Tumbleweed and CoreStreet get around the download requirement by setting up a middleman, which forwards a request for a signature validation posted by the PKI user to a CRL, collects the response and prompts the desktop application to accept or reject the e-mail.
This all takes place in a fraction of a second, and the request and response files are typically only 1K in size.
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