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PSA: Passwordless authentication is a valid and easy-to-implement authentication technique: http://www.east5th.co/blog/2017/04/24/passwordless-authentic... https://auth0.com/passwordless

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Another PSA: SMS and email are both less secure channels than your average https login. My doctor doesn't trust these channels to communicate my test results, so I guess don't use this for anything more sensitive than that.

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