Yes. The first time you log in from a new device, you'll receive a one-time secure access code. If the device you're using is a computer you use often and always physically control, you may choose to register it. Then whenever you log in, you'll be recognized on the computer. Remember to register only on devices you trust to keep your data secure. Registering a public computer puts your security at risk, as anyone who uses that computer after you may be able to access your account.