2-factor auth won't be available at beta launch (it's a MVP, we still have to see if there's enough interest), but we'll probably add 2-factor auth using https:

2-factor auth won't be available at beta launch (it's a MVP, we still have to see if there's enough interest), but we'll probably add 2-factor auth using https://www.authy.com https://www.authy.com at some point.