How to stay safe on public Wi-Fi

You're in between flights and you're on a deadline. That "Free Public Wi-Fi" sign on the wall next to your gate looks tempting, but you pause before logging in—don't hackers lurk on public Wi-Fi, just waiting for clueless passengers like you to offer up your personal information?

The answer is yes, they do. But that doesn't mean you have to give up public Wi-Fi altogether. There are plenty of ways to protect yourself and your sensitive info while using free public Wi-Fi.

We'll explain how hackers use public Wi-Fi to sneak into your accounts, and we'll walk you through the steps you should take to fly under their radar and browse safely.

The best way to beat a hacker is to think like one. Stay one step ahead by understanding how hackers and identity thieves try to take advantage of unsuspecting public Wi-Fi users.

• Fake hotspots. Like luring in kids with candy, hackers will try to lure you in with the promise of a free, easy, open Wi-Fi network. The catch? They're in control, and they can see everything you're doing online.
• File sharing. Hackers may use open file-sharing networks and AirDrop to infect your computer with malicious software (malware) or other viruses that can open up holes in your system and let them in.
• System upgrade alerts. You might think that performing a system upgrade will help keep you safer, but it could be a hacker acting like a wolf in sheep's clothing. Anytime you click on an alert while you're on public Wi-Fi, you could end up with a virus instead of an upgrade.
• Peeping toms. Simply put, if you're using the same network as a hacker, they can see everything you're doing online, including the sites you visit, the passwords you use, and the personal information you share. Armed with that information, they can steal money from your bank account, open up fraudulent accounts in your name, and commit other damaging crimes.

Anytime you use public Wi-Fi managed by someone else, it's always somewhat unsecured. Unlike your home Wi-Fi, you don't know who else has the password, so you don't know who else might be on the network with you. For that reason, you should treat every public Wi-Fi network as potentially unsafe.

• Unsecured Wi-Fi
  Unsecured Wi-Fi (aka, "open" Wi-Fi) is the kind you find at McDonald's and airports: no password needed. As long as you're in range of the router, anyone can hop on the Wi-Fi and surf the web to their heart's content. Unsecured Wi-Fi is about as public—and as risky—as you can get.
• Secured Wi-Fi
  Secured Wi-Fi (AKA, "semi-open" Wi-Fi) typically requires a little more work to access than unsecured. You will usually need a password to log in, and you may be required to check a box on a terms and conditions page before gaining internet access. Some businesses also require a purchase before you can access their secured Wi-Fi. If you have a choice, always opt for secured Wi-Fi.

Just like knowing the dangers of sun exposure doesn’t mean you should never go outside, knowing the security risks of using public Wi-Fi doesn't mean you should never use it. Here are your hat and sunscreen equivalents for enjoying public Wi-Fi:

Firewalls and antivirus software can warn you of suspicious websites and files, and protect your system against hackers trying to get at your data.

Turn off all features on your phone, laptop, or tablet that allow your device to automatically connect with another device or public wireless networks. This includes file sharing, AirDrop, and printer sharing.

You want Wi-Fi that is secure, legitimate and has as few users as possible. Look for a network that is password-protected, connected to a high-profile brand (like Starbucks), and tied to a business with small square footage.

Password protection and small square footage limit the traffic on the network, and high-profile brands are more likely to run a tighter network ship because they have more to lose from a hacking scandal.

Don't click on any pop-up windows asking you to install or download something in order to log on to free public Wi-Fi. Don't download anything from the web, and always avoid doing any system upgrades or updates while on public Wi-Fi.

When possible, make sure every site you use has that little "s" for "secure" after the HTTP in the web address and the padlock symbol to the left. HTTPS sites are more secure than HTTP sites because they use encryption to protect any data you might send to the site's server.

Even with HTTPS, it's still risky to input any personal info while you're using public Wi-Fi.

Just like you limit your risk of catching a cold by avoiding the number of strangers' hands you shake in a day, you'll limit your exposure to public Wi-Fi danger by limiting the number of open networks you connect to.

Be sure to click the "forget network" option on your network preferences once you finish using an open network. This will prevent your device from automatically connecting to it again without your permission.

If you've made it through the do's and don'ts and you'd still like to take advantage of free public Wi-Fi hotspots, here are a few additional security measures you can take to protect yourself out in the public Wi-Fi jungle.

• Keep your security updates current. Yes, they take forever and they're a big pain, but keeping your device's security updates current will keep you safer on public Wi-Fi.
• Use two-factor authentication on your accounts. Two-factor authentication requires you to use a password and something else—like a security question or a PIN—to get access to an account. Using this on all your accounts is a good way to thwart any hackers who might get your password.
• Use a VPN (Virtual Private Network). A VPN lets you surf the web anonymously by routing all your web activities through a secure, encrypted server. VPNs are a good choice if you're a frequent traveller on public transport. Keep in mind that paid VPN services are more reliable and secure than free ones, and they cost only a few bucks a month.

If you've decided public Wi-Fi is too risky and you'd like to avoid it altogether, here are a few safer alternatives for you to consider.

• Use free hotspots offered by your mobile provider. Many companies now offer their registered customers exclusive access to public Wi-Fi hotspots.
• Use an unlimited data plan on your smartphone. If you just want to use the internet to play games and surf social media, using unlimited data on your phone is a safer choice than logging on to public Wi-Fi.
• Use your smartphone as a private hotspot. If you need to use a computer or tablet, consider using your phone as a hotspot to connect to Wi-Fi so you can still conduct your online business in private.

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