In Excel, custom input or error messages explain the rules for each field to prevent data-entry errors. Here's how to set them up in a spreadsheet.

In other words, there are clear and obvious security risks to having users input codes received as text messages for account authentication, and QR codes would eliminate some of those risks.

SMS-based two-factor authentication has security issues. That's why Google is finally replacing it with something better soon.

SMS codes have long been less secure than other forms of authentication. With QR codes, Google aims to reduce users' dependency on carriers for account verification.

Google confirmed that it will soon phase out SMS codes from Gmail sign-ins for QR codes.

As reported by Bloomberg Businessweek, an obscure third-party telecom service had access to at least one million 2FA codes that passed through its network.