Is public wi-fi access safe?

Is public wi-fi access safe?

Category: Security , Wireless

If you use wireless Internet access in public places like Starbucks or the airport, you should take some simple precautions to make sure you're not broadcasting your passwords and other personal info to others in the vicinity...


Surfing Safely in Starbucks...

A few months ago I met with a group of Internet professionals, all of us sporting laptops with wireless connections to the hotel's access point. On the second day of the conference, one of the attendees put up a slide on the overhead showing logins and passwords from a dozen of the attendees. Needless to say, many jaws dropped open.

He was running a "sniffer" program that anyone can download to spy on the internet traffic floating around in the air. Fortunately, he was a trusted colleague, and was nice enough to tell us that we were caught with our virtual pants down.

Wifi Safety Tips

First, be aware that (almost) ANYTHING that you type or any info that appears on your screen while you're using a wireless connection can be seen by others nearby.

If you are accessing a page that requires a login and password, or if you are entering ANY personal data (credit card, SSN, etc) make sure that you are on a secure site. That's easy enough -- just check that the web address begins with https instead of the usual http -- and your information will be safely encrypted before transmission. As long as you're on a page with an address that begins with https, the data you send and receive is protected from sniffers and snoopers.

But be on your guard, some web-based email providers have a secure login page, but after you're logged in the access reverts to normal non-encrypted mode. So any email you send or receive while on a wireless connection is out in the clear. Google's GMail and Yahoo Mail are examples of webmail services that work this way. Until recently Hotmail didn't even offer a secure login option. So look for the link or checkbox for the secure login when accessing your web-based email. If your service doesn't offer one, consider switching or decide to live with the security exposure.

Oh, and there are the "shoulder surfers" to watch out for. Just like when you're entering your PIN code at an ATM, you need to keep an eye open for anyone who might be glancing over your shoulder while you hunt and peck in the airport or coffeeshop. I always use two fingers when entering my pin or password... one presses the correct key and other is a decoy. So even if someone was watching from across the street with binoculars, it's almost impossible to steal a password.

And beware of the Evil Twins! Aunty Spam's Net Patrol warns of a scam where a hacker may put up a bogus copy of the wi-fi hotspot's login page. Learn how to stay safe from this attack by reading this helpful article:

http://www.theinternetpatrol.com/wifi-hotspot-evil-twins-mimic-wi-fi-hotspots-and-steal-your-data

Securing Your Wireless HOME Network

Do you have a wireless laptop and router at home? You may be providing free internet access to your neighbors, or opening your system to drive-by hackers. Don't miss my article on securing your wireless home network, here:

http://www.askbobrankin.com/wireless_security.html

Got something to say about wi-fi security? Post your comments below.

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Posted by on 28 Feb 2006


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Most recent comments on "Is public wi-fi access safe?"

(See all 11 comments for this article.)

Posted by:

Ian
01 Mar 2006

Hi Bob:

Gmail actually does provide an https: connection for its email (https://mail.google.com), one just has to ensure it stays in place as it will sometimes revert back to the http: URL when one tries to compose an email. If that happens one just needs to put the "s" back into the URL and voila - a secure email solution. They do seem to have a problem maintaining the state though their support desk assures me they are working on the problem.

cheers,


Posted by:

Marc Bourassa
06 Mar 2006

Hi Bob,

As always, great information! Regarding Gmail, I'm not sure what I'm doing right (!), but when I first started using Gmail I explicitly ensured I was using https and it seems to have "stuck" ever since. I just checked my gmail tab which I've been using all day and it's still secure. So there *is* hope... Maybe it's the URL I use to access it -- https://gmail.google.com/gmail


Posted by:

Amy
25 May 2006

Regarding wi-fi from a home router--what if you have wi-fi at home and don't mind your neighbors sharing it--especially if they help pay the bill? Is there anything wrong with 3 friendly neighbors sharing internet access through a wifi connection that they can all access? The occasional drive-by user doesn't bother me as long as my info is secure (that is, as long as I ensure I'm using a secure site whenever it matters, like for email.)

EDITOR'S NOTE: Aside from the fact that you are probably defrauding your ISP (check your terms of service) there's always the question of some unfriendly person tapping into your unsecured system. Make sure you have a software firewall, and top-notch anti-malware protection.


Posted by:

JC Dill
13 Jun 2006

You forgot to discuss the problems with using non-web email - e.g. sending your email password "in the clear" when checking your email using POP on port 110. Anyone who uses a laptop on insecure wireless networks needs to configure their email software to check and send email in a secure fashion. Ask your email provider if they offer secure POP on port 995, secure IMAP on port 993, and secure SMTP on port 465 or port 587.

EDITOR'S NOTE: Good point. It's been so long since I used a POP mail client (such as Outlook, Thunderbird or Eudora) that I didn't even consider it. Love my webmail! Another secure option, if you don't want to twiddle with the settings in your email program (or fight with your ISP) is to login to a remote computer with LogMeIn, and access your POP mail from there.


Posted by:

jmwav
27 Sep 2006

What about wifi connection of digital photo cameras? models like nikon p3 , s6 that have wifi connection are safe ? or some data (photos) during wifi tranfer cab be stolen? Does S6 have both options to transfer photos to your computer with and without wire? (for safety reasons)

EDITOR'S NOTE:If wireless cameras connect to your router in the same way as a PC, and there is no encryption, then yes, it's possible (but very unlikely) for this data to be intercepted.


Posted by:

Charles Heineke
12 Oct 2007

You have a link in the article above to http://www.aunty-spam.com/wifi-hotspot-evil-twins-mimic-wi-fi-hotspots-and-steal-your-data which is supposed to warn of a scam where a hacker may put up a bogus copy of the wi-fi hotspot's login page. That page now just displays various ads and not the information mentioned. So you may want to remove that link or find another to replace it.

EDITOR'S NOTE: Sorry the domain changed. Fixed now!


Posted by:

Ron
16 Mar 2010

I've searched the Comments and can't find that anyone raised this point, on the article's topic:

Let's assume I'm at a public, open Wi-Fi hotspot, and want to access my Gmail on the netbook without risk to my password, without a VPN. I don't want to conduct the entire session with the 3G modem, since my provider puts monthly bandwidth limits on wireless access.

Would I be close to 100% safe if I do this, just before the password has to be entered:

1) Plug in my 3G modem and wait until it connects.

2) Hit the function key combination that cuts power to the netbook's Wi-Fi card. I wait until I see 'Wi-Fi disconnected', then wait for 'Auto Mobile Broadband connected'.

3) Supply UserName and Password, hit Enter, wait for log-in confirmation on Gmail (for example).

4) Again apply hotkey to turn Wi-Fi connection 'on'.

5) Open Network Manager Applet and de-select the 3G modem. When modem disconnection is verified, pull it out.

6) Applet automatically switches, sensing the loss of the 3G modem.

7) Resume accessing mailboxes via the open connection (or doing banking, with whichever passwords that must remain confidential).

Although someone could possibly see the contents of my mail (or banking account) while I'm working on it (??) is there any way they could re-enter after I log off, given the above precaution?

[Bob, if this procedure doesn't accomplish anything beneficial, feel free to edit-out and summarize the steps and then give the reason it would fail ]

EDITOR'S NOTE: That's WAY too hard. Just login to Gmail or your online banking with HTTPS in the URL. That will ensure the session is encrypted and secure. There's even an option in the Gmail settings to always force a secure session.


Posted by:

NinjaSMS
12 Nov 2010

Good information. The only objection I have is with you grouping all hackers in one bunch. There is a difference with 'hackers' the good guys who improve security by responsibly exploiting security holes and 'malicious hackers' the bad guys who give hackers a bad name with their malicious intent. Other than that good stuff.


Posted by:

Greg
01 Apr 2011

Question: Does using OpenVPN with ShieldExchange.com completely protect you at public WiFi hotspots? Or not?

Thank you in advance.


Posted by:

Greg
03 Apr 2011

I keep checking this page for an answer to my post. I realize you're busy. Sorry to bother you.

EDITOR'S NOTE: If you are using a VPN, I don't see why you would need additional protection.


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