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This can happen in several ways, including a phishing attack, malware or credit-card-reader skimming. To hack two-factor authentication, the bad guys must acquire either the physical component of the log-in, or must gain access to the cookies or tokens placed on the device by the authentication mechanism. 'When you make an attack harder, you're disabling a certain subset of the hacker community,' he said. 2FA mitigates the problems, but a lot of awful attacks can run on 2FA.'ДЄt the same time, he said, two-factor offered more protection than logging in without it. 'The thing that concerns me as a security guy is that people don't look at what the cause of the threats might be. One of the most high-profile cases of a compromised two-factor system occurred in 2011, when security company RSA revealed that its SecurID authentication tokens had been hacked.ДЇenton explained both sides of the effectiveness problem. It's true that two-factor authentication is not impervious to hackers. Well, that's a loaded question when it comes to security. 'So, 2FA is a good thing, but it does make the user experience more complicated.It's done when you're logging into an account on your device for the first time, for example.' Will two-factor authentication protect me? 'An attacker might be able to collect a cookie or an OAuth token from a website and essentially take over their session,' he said. Much also depends on your patience and your willingness to spend the extra time to ensure a higher level of security.ДЇenton said that while two-factor authentication makes it harder to log in, it's not 'hugely' more so. It definitely adds an extra step to your log-in process, and depending on how the account vendor, such as Twitter, has implemented it, it can be a minor inconvenience or a major pain. You must provide a physical factor, the card, and a knowledge factor, the ZIP code.Д«ut just because it's been around for a long time doesn't mean that it's easy to set up and use.

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When you use your credit card and you must enter in your ZIP code to confirm a charge, that's an example of 2FA in action.

Something you are, such as a biometric like a fingerprint or voice print.

Something you have, such as an ATM card, phone, or fob.

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Something you know, such as a personal identification number (PIN), password or a pattern.2FA requires the user to have two out of three types of credentials before being able to access an account. When you have to enter only your username and one password, that's considered a single-factor authentication. Two-factor authentication adds a second level of authentication to an account log-in. Here's a rundown of what two-factor authentication is, how it can work for you, and what its limitations are. 'Two-factor authentication does help, but Twitter is a high-value target, and it needs to be protected like one,' said Jim Fenton, chief security officer at OneID, an enterprise password replacement system. SMS is 'universal in some respects all you need is a mobile phone.'Д«ut Twitter has faced some backlash, he said, because many of the highest-profile Twitter hacks have been against corporate Twitter accounts. 'Twitter made the decision to use SMS because it makes sense from their position,' said Jon Oberheide, chief technology officer of Duo Security, which uses apps to prove identity.

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How to enable two-factor authentication for: