Yahoo's On-Demand (In)Security

Passwords are insecure and annoying. I get that, I have written about it, and I experience it. So lots of companies and organizations are working on replacing passwords with something that is both more secure and more convenient. For example, Twitter's Digits service. Other approaches, like 1Password's password manager, make passwords easier to manage and auto-generate, so they simultaneously can be more secure and more convenient. Then there are "