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A comment on Ask HN: Alternatives to Yubikey?. Parent comment

Re:Ask HN: Alternatives to Yubikey? by tptacek on Monday June 12, 2017 @05:04PM (#14541102)
The entire security model depends on the devices being uncloneable.
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Re:Ask HN: Alternatives to Yubikey? by noja on Monday June 12, 2017 @05:13PM (#14541170)
But my security model does not allow putting myself in a position where I am stranded without my second factor (or doing huge amounts of work re-registering everything).
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Re:Ask HN: Alternatives to Yubikey? by tptacek on Monday June 12, 2017 @05:16PM (#14541183)
That's why you set up backup factors.

It is for the same reason that services like Google Mail won't let you set up a U2F token without a backup factor.

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