A million two-factor authentication codes sent via SMS passed through an obscure third-party company. Here's how it happened ...

Examples of Two-Factor Authentication (2FA) ... but also a multi-digit code that Apple will send to one of the user's devices, such as their iPhone. ...

Today, the Microsoft-owned company says, only 16.5% of active GitHub users and 6.44% of npm users use 2FA. That is not a lot, and frankly fewer than I would have expected.