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Re:The “Cobra Effect” that is disabling paste on password fi... by wtracz on Sunday June 26, 2016 @06:34AM (#11980191)
They can use Shamir's Secret Sharing to achieve this with no plaintext.

see http://willtracz.co.uk/shamir-secret-sharing-and-passwords

Re:The “Cobra Effect” that is disabling paste on password fi... by nxzero on Sunday June 26, 2016 @09:16AM (#11980621)
>> "This post is intended to introduce concepts and practically demonstrate a method. The implementation provided is not a reliable/hardened solution (i.e. there are vulnerabilities because finite fields are not used) and should not be used anywhere near a production system."

Above is on the page you're linking to.

Re:The “Cobra Effect” that is disabling paste on password fi... by wtracz on Monday June 27, 2016 @09:03AM (#11985864)
Yes, I wrote it and it is intended as a demo only. I have not put in the finite field logic in that implementation. It shows the concepts though.