Some nuances to consider:

Bitbucket requires 2FA resubmission to view/update settings, not just password 
reconfirmation.

Reconfiguration vs (re)adding a phone with the same key as before.

* GitHub says "You’re about to change your two-factor authentication device. 
This will invalidate your current two-factor devices. This will not affect your 
recovery codes or fallback SMS configuration. Those can be updated on the 
two-factor settings page."
* Bitbucket only lets you disable, then re-enable
* Dreamhost has separate options to view your key, vs regenerate.  I like this.

Many sites will show you the text form of the key, so you can enter it 
manually.  Not sure if this is really needed for anyone?  Phones/apps without 
camera support?




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** [tickets:#8117] Implement core 2FA**

**Status:** in-progress
**Milestone:** unreleased
**Labels:** security 
**Created:** Mon Aug 15, 2016 03:54 PM UTC by Dave Brondsema
**Last Updated:** Mon Aug 15, 2016 03:54 PM UTC
**Owner:** Dave Brondsema


This ticket is for the essential functionality for TOTP 2FA, separate tickets 
for other aspects

Some details at 
http://mail-archives.apache.org/mod_mbox/allura-dev/201608.mbox/%3C28c7a399-86c5-5d75-dde4-2ab54fe7b3e4%40brondsema.net%3E


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