Safe Browsing—protecting web users for five years and counting

In this post, we've collected some highlights from the past five years of our Safe Browsing efforts, aimed at keeping people safe online. See the Security Blog for the full details and more visuals. -Ed.

Five years ago, we launched Safe Browsing, an initiative designed to keep people safe from malicious content online. Our primary goal was to safeguard Google's search results against malware (software capable of taking control of your computer) and phishing (fraudulent websites that entice users to give up their personal information). We also wanted to help educate webmasters on how to protect their own sites.

Malware and phishing are still big problems online, but our Safe Browsing team has labored continuously to adapt to the rising challenges of new threats. We've also developed an infrastructure that automatically detects harmful content around the globe.

Here’s a look at the highlights from our efforts over the past five years:

• We protect 600 million users through built-in protection for Chrome, Firefox and Safari, where we show several million security warnings every day to Internet users. When we detect malware or phishing, we trigger a red warning screen that discourages clicking through to the website. Our free and public Safe Browsing API allows other organizations to keep their users safe by using the data we’ve compiled.
• We find about 9,500 new malicious websites every day and show warnings to protect users. These are either innocent websites that have been compromised by malware authors, or others that are built specifically for malware distribution or phishing. Our detection techniques are highly accurate—we have had only a handful of false positives.
• Approximately 12-14 million Google Search queries per day warn users about current malware threats, and we provide malware warnings for about 300 thousand downloads per day through our download protection service for Chrome.
• We send thousands of notifications daily to webmasters. When webmasters sign up for Webmaster Tools we give them the option to receive warning notices if we find something malicious on their site.

Malware and phishing aren’t completely solvable problems because threats continue to evolve, but our technologies and processes do, too.

Phishing and malware trends
Online commerce sites are still favorite phishing targets because phishers are motivated by money. Some tried-and-true phishing methods are still used, but attacks are also getting more creative and sophisticated. Attacks are faster, with phishers sometimes remaining online for less than an hour to try to avoid detection. They’re also more geographically dispersed and are getting more targeted.

Malware authors often compromise legitimate sites to deliver content from a malicious attack site or to redirect to an attack site. These attack sites will often deliver "drive-by downloads" to visitors, which launch and run malware programs on their computers without their knowledge. To try to avoid detection, these attack sites adopt several techniques, such as rapidly changing their Internet location with free web hosting services and auto-generated domain names. Although less common than drive-by downloads, we’re also seeing more malware authors bypassing software vulnerabilities altogether and instead employing methods to try to trick users into installing malicious software—for example, fake anti-virus software.

How you can help prevent malware and phishing
Our system is designed to protect users at high volumes, but people still need to take steps to keep their computers safe. Ignoring a malware problem is never a good idea—if one of our warnings pop up, you should never click through to the suspicious site. Webmasters can help protect their visitors by signing up for malware warnings at Google Webmaster Tools. These warnings are free and will help us inform them if we find suspicious code on their sites. Finally, everyone can help make our system better. You can opt-in to send additional data to our team that helps us expand the coverage of Safe Browsing.

Looking forward
Some of our recent work to counter new forms of abuse includes:

• Instantaneous phishing detection and download protection within the Chrome browser
• Chrome extension malware scanning
• Android application protection

It’s a good feeling to know that we’re making the web more secure and directly protecting people from harm—whether they’re our users or not. We continue to invest heavily in the Safe Browsing team so we can defend against current and future security threats.

Posted by Niels Provos, Security Team

Tech tips that are Good to Know

Does this person sound familiar? He can’t be bothered to type a password into his phone every time he wants to play a game of Angry Birds. When he does need a password, maybe for his email or bank website, he chooses one that’s easy to remember like his sister’s name—and he uses the same one for each website he visits. For him, cookies come from the bakery, IP addresses are the locations of Intellectual Property and a correct Google search result is basically magic.

Most of us know someone like this. Technology can be confusing, and the industry often fails to explain clearly enough why digital literacy matters. So today in the U.S. we’re kicking off Good to Know, our biggest-ever consumer education campaign focused on making the web a safer, more comfortable place. Our ad campaign, which we introduced in the U.K. and Germany last fall, offers privacy and security tips: Use 2-step verification! Remember to lock your computer when you step away! Make sure your connection to a website is secure! It also explains some of the building blocks of the web like cookies and IP addresses. Keep an eye out for the ads in newspapers and magazines, online and in New York and Washington, D.C. subway stations.



The campaign and Good to Know website build on our commitment to keeping people safe online. We’ve created resources like privacy videos, the Google Security Center, the Family Safety Center and Teach Parents Tech to help you develop strong privacy and security habits. We design for privacy, building tools like Google Dashboard, Me on the Web, the Ads Preferences Manager and Google+ Circles—with more on the way.

We encourage you to take a few minutes to check out the Good to Know site, watch some of the videos, and be on the lookout for ads in your favorite newspaper or website. We hope you’ll learn something new about how to protect yourself online—tips that are always good to know!

Update Jan 17: Updated to include more background about Good to Know.

Posted by Alma Whitten, Director of Privacy, Product and Engineering

Making search more secure

We’ve worked hard over the past few years to increase our services’ use of an encryption protocol called SSL, as well as encouraging the industry to adopt stronger security standards. For example, we made SSL the default setting in Gmail in January 2010 and introduced an encrypted search service located at https://encrypted.google.com four months later. Other prominent web companies have also added SSL support in recent months.

As search becomes an increasingly customized experience, we recognize the growing importance of protecting the personalized search results we deliver. As a result, we’re enhancing our default search experience for signed-in users. Over the next few weeks, many of you will find yourselves redirected to https://www.google.com (note the extra “s”) when you’re signed in to your Google Account. This change encrypts your search queries and Google’s results page. This is especially important when you’re using an unsecured Internet connection, such as a WiFi hotspot in an Internet cafe. You can also navigate to https://www.google.com directly if you’re signed out or if you don’t have a Google Account.

What does this mean for sites that receive clicks from Google search results? When you search from https://www.google.com, websites you visit from our organic search listings will still know that you came from Google, but won't receive information about each individual query. They can also receive an aggregated list of the top 1,000 search queries that drove traffic to their site for each of the past 30 days through Google Webmaster Tools. This information helps webmasters keep more accurate statistics about their user traffic. If you choose to click on an ad appearing on our search results page, your browser will continue to send the relevant query over the network to enable advertisers to measure the effectiveness of their campaigns and to improve the ads and offers they present to you.

As we continue to add more support for SSL across our products and services, we hope to see similar action from other websites. That’s why our researchers publish information about SSL and provide advice to help facilitate broader use of the protocol. We hope that today’s move to increase the privacy and security of your web searches is only the next step in a broader industry effort to employ SSL encryption more widely and effectively.

Posted by Evelyn Kao, Product Manager

National Cyber Security Awareness Month 2011: Our Shared Responsibility

(Cross-posted on the Public Policy Blog)

On the Internet, as with the offline world, the choices we make often have an impact on others. The links we share and the sites we visit can affect our security and sometimes introduce risk for people we know. Given how quickly our collective use of technology is evolving, it’s useful to periodically remind ourselves of practices that can help us achieve a more secure and enjoyable online experience.

This month, Google once again joins the National Cyber Security Alliance (NCSA), government agencies, corporations, schools and non-profit organizations in recognizing National Cyber Security Awareness Month. It’s a time for us to offer education that increases online security for everyone.

It’s fitting that the theme of this year’s Cyber Security Awareness Month is “Our Shared Responsibility.” With ever-increasing ways to access the web and share information, we need to focus on keeping our activities secure. In that spirit, and to help kick off Cyber Security Awareness Month, we’re introducing a new Google Security Center. The Security Center is full of practical tips and information to help people stay safe online, from choosing a secure password to using 2-step verification and avoiding phishing sites and malware.

We also continue to develop products and services that help people protect their information online. Examples that have stood out so far this year include the Chromebook, 2-step verification in 40 languages, and Chrome browser warnings for malicious downloads and out-of-date plugins, among others. We develop free products and tools such as DOM Snitch, a Chrome extension that helps developers identify insecure code.

We recognize the importance of security education and are committed to helping make your online experience both exciting and safe to use. We all have a responsibility to take steps to protect ourselves and together develop a culture of security. We encourage everyone to Stop. Think. Connect.

Posted by Eric Davis, Public Policy Manager, Security

2-step verification: stay safe around the world in 40 languages

(Cross-posted on the Online Security Blog)

Earlier this year, we introduced a security feature called 2-step verification that helps protect your Google Account from threats like password compromise and identity theft. By entering a one-time verification code from your phone after you type your password, you can make it much tougher for an unauthorized person to gain access to your account.

People have told us how much they like the feature, which is why we're thrilled to offer 2-step verification in 40 languages and in more than 150 countries. There’s never been a better time to set it up: Examples in the news of password theft and data breaches constantly remind us to stay on our toes and take advantage of tools to properly secure our valuable online information. Email, social networking and other online accounts still get compromised today, but 2-step verification cuts those risks significantly.

We recommend investing some time in keeping your information safe by watching our 2-step verification video to learn how to quickly increase your Google Account’s resistance to common problems like reused passwords and malware and phishing scams. Wherever you are in the world, sign up for 2-step verification and help keep yourself one step ahead of the bad guys.

To learn more about online safety tips and resources, visit our ongoing security blog series, and review a couple of simple tips and tricks for online security. Also, watch our video about five easy ways to help you stay safe and secure as you browse.

Update on 12/1/11: We recently made 2-step verification available for users in even more places, including Iran, Japan, Liberia, Myanmar (Burma), Sudan and Syria. This enhanced security feature for Google Accounts is now available in more than 175 countries.

Posted by Nishit Shah, Product Manager, Google Security

Using data to protect people from malware

(Cross-posted on the Google Online Security Blog)

The Internet brings remarkable benefits to society. Unfortunately, some people use it for harm and their own gain at the expense of others. We believe in the power of the web and information, and we work every day to detect potential abuse of our services and ward off attacks.

As we work to protect our users and their information, we sometimes discover unusual patterns of activity. Recently, we found some unusual search traffic while performing routine maintenance on one of our data centers. After collaborating with security engineers at several companies that were sending this modified traffic, we determined that the computers exhibiting this behavior were infected with a particular strain of malicious software, or “malware.” As a result of this discovery, today some people will see a prominent notification at the top of their Google web search results:

This particular malware causes infected computers to send traffic to Google through a small number of intermediary servers called “proxies.” We hope that by taking steps to notify users whose traffic is coming through these proxies, we can help them update their antivirus software and remove the infections.

We hope to use the knowledge we’ve gathered to assist as many people as possible. In case our notice doesn’t reach everyone directly, you can run a system scan on your computer yourself by following the steps in our Help Center article.

Update July 20, 2011: We've seen a few common questions we thought we'd address here:

• The malware appears to have gotten onto users' computers from one of roughly a hundred variants of fake antivirus, or "fake AV" software that has been in circulation for a while. We aren't aware of a common name for the malware.
• We believe a couple million machines are affected by this malware.
• We've heard from a number of you that you're thinking about the potential for an attacker to copy our notice and attempt to point users to a dangerous site instead. It's a good security practice to be cautious about the links you click, so the spirit of those comments is spot-on. We thought about this, too, which is why the notice appears only at the top of our search results page. Falsifying the message on this page would require prior compromise of that computer, so the notice is not a risk to additional users.
• In the meantime, we've been able to successfully warn hundreds of thousands of users that their computer is infected. These are people who otherwise may never have known.

Posted by Damian Menscher, Security Engineer

Ensuring your information is safe online

The Internet has been an amazing force for good in the world—opening up communications, boosting economic growth and promoting free expression. But like all technologies, it can also be used for bad things. Today, despite the efforts of Internet companies and the security community, identity theft, fraud and the hijacking of people’s email accounts are common problems online.

Bad actors take advantage of the fact that most people aren’t that tech savvy—hijacking accounts by using malware and phishing scams that trick users into sharing their passwords, or by using passwords obtained by hacking other websites. Most account hijackings are not very targeted; they are designed to steal identities, acquire financial data or send spam. But some attacks are targeted at specific individuals.

Through the strength of our cloud-based security and abuse detection systems*, we recently uncovered a campaign to collect user passwords, likely through phishing. This campaign, which appears to originate from Jinan, China, affected what seem to be the personal Gmail accounts of hundreds of users including, among others, senior U.S. government officials, Chinese political activists, officials in several Asian countries (predominantly South Korea), military personnel and journalists.

The goal of this effort seems to have been to monitor the contents of these users’ emails, with the perpetrators apparently using stolen passwords to change peoples’ forwarding and delegation settings. (Gmail enables you to forward your emails automatically, as well as grant others access to your account.)

Google detected and has disrupted this campaign to take users’ passwords and monitor their emails. We have notified victims and secured their accounts. In addition, we have notified relevant government authorities.

It’s important to stress that our internal systems have not been affected—these account hijackings were not the result of a security problem with Gmail itself. But we believe that being open about these security issues helps users better protect their information online.

Here are some ways to improve your security when using Google products:

• Enable 2-step verification. This Gmail feature uses a phone and second password on sign-in, and it protected some accounts from this attack. So check out this video on setting up 2-step verification.

• Use a strong password for Google that you do not use on any other site. Here’s a video to help.
• Enter your password only into a proper sign-in prompt on a https://www.google.com domain. We will never ask you to email your password or enter it into a form that appears within an email message. Here’s a video with more advice.
• Check your Gmail settings for suspicious forwarding addresses (“Forwarding and POP/IMAP” tab, Fig. 1) or delegated accounts (“Accounts” tab, Fig. 2).

Fig. 1

 Fig. 2

• Watch for the red warnings about suspicious account activity that may appear on top of your Gmail inbox.
• Review the security features offered by the Chrome browser. If you don’t already use Chrome, consider switching your browser to Chrome.
• Explore other security recommendations and a video with tips on how to stay safe across the web.

Please spend ten minutes today taking steps to improve your online security so that you can experience all that the Internet offers—while also protecting your data.

*We also relied on user reports and this external report to uncover the campaign described.

Posted by Eric Grosse, Engineering Director, Google Security Team

Advanced sign-in security for your Google account

(Cross-posted on the Gmail Blog)

Has anyone you know ever lost control of an email account and inadvertently sent spam—or worse—to their friends and family? There are plenty of examples (like the classic "Mugged in London" scam) that demonstrate why it's important to take steps to help secure your activities online. Your Gmail account, your photos, your private documents—if you reuse the same password on multiple sites and one of those sites gets hacked, or your password is conned out of you directly through a phishing scam, it can be used to access some of your most closely-held information.

Most of us are used to entrusting our information to a password, but we know that some of you are looking for something stronger. As we announced to our Google Apps customers a few months ago, we've developed an advanced opt-in security feature called 2-step verification that makes your Google Account significantly more secure by helping to verify that you're the real owner of your account. Now it's time to offer the same advanced protection to all of our users.

2-step verification requires two independent factors for authentication, much like you might see on your banking website: your password, plus a code obtained using your phone. Over the next few days, you'll see a new link on your Account Settings page that looks like this:

Take your time to carefully set up 2-step verification—we expect it may take up to 15 minutes to enroll. A user-friendly set-up wizard will guide you through the process, including setting up a backup phone and creating backup codes in case you lose access to your primary phone. Once you enable 2-step verification, you'll see an extra page that prompts you for a code when you sign in to your account. After entering your password, Google will call you with the code, send you an SMS message or give you the choice to generate the code for yourself using a mobile application on your Android, BlackBerry or iPhone device. The choice is up to you. When you enter this code after correctly submitting your password we'll have a pretty good idea that the person signing in is actually you.

It's an extra step, but it's one that significantly improves the security of your Google Account because it requires the powerful combination of both something you know—your username and password—and something that only you should have—your phone. A hacker would need access to both of these factors to gain access to your account. If you like, you can always choose a "Remember verification for this computer for 30 days" option, and you won't need to re-enter a code for another 30 days. You can also set up one-time application-specific passwords to sign in to your account from non-browser based applications that are designed to only ask for a password, and cannot prompt for the code.

To learn more about 2-step verification and get started, visit our Help Center. And for more about staying safe online, see our ongoing security blog series or visit http://www.staysafeonline.org/. Be safe!

Update Dec 7, 2011: Updated the screenshots in this post.

Posted by Nishit Shah, Product Manager, Google Security

National Cyber Security Awareness Month 2010: Stop. Think. Connect.

Governments, industry and everyday people have been abuzz this year about online security to a larger extent than ever before. People are talking about their information, how they share it with others and how they secure it. With more information moving online, and with cyber attacks on the rise, we think it’s important that we keep the conversation about security flowing.

Google has renewed its commitment to security this year and has pushed industry boundaries to help people better protect their information in new ways. Here are just a few examples: We became the first major email provider to offer default HTTPS encryption for the entire email session, and we introduced an encrypted search option for Google.com. We designed a new system to make Google Accounts more secure, and added suspicious activity detection for our users. Google Apps became the first suite of cloud computing applications to receive Federal Information Security Management Act (FISMA) certification from the U.S. government. We also published new security products, tools and research to help web developers and network administrators make the rest of the web more secure.


I sit on the board of the National Cyber Security Alliance (NCSA) to promote work that encourages safer online habits. Together with that organization, the U.S. Department of Homeland Security (DHS) and a host of other companies, Google is taking the month of October to recognize National Cyber Security Awareness Month. As we did in a blog post series last year, we’ll explore simple ways that people can make use of Google’s technologies and tools, as well other freely available resources and advice, to better protect themselves and their information.

We will post links here throughout the month, so be sure to check back often:

Tips and Tricks: Sharing Google Docs Like a Pro
Protect your data in the cloud
This Internet is Your Internet: Digital Citizenship from California to Washtenaw County

Understanding the omnibox for better security (Google Chrome Blog)

Safe browsing on Blogger

Stop. Think. Connect. To protect yourself from fake Checkout invoices.

Tips for a more secure orkut experience

Remember these tips for safer shopping

Remember, even with so many people and groups focused on creating a safer web experience for everyone, we all have a responsibility to take steps to protect ourselves online. The NCSA recommends that we keep our wits about us and think carefully about our online actions before we take them. In that spirit, we encourage you to: Stop. Think. Connect.


Posted by Eric Davis, Public Policy Manager, Security

Three million businesses have gone Google: celebrating growth, innovation and security

Today we’re hosting more than 300 CIOs and IT professionals from around the world in Paris at Google Atmosphere, our annual European event dedicated to cloud computing—web-based applications that are built on shared infrastructure and delivered through the browser. This year, the discussion at Atmosphere is focused on how companies can benefit from the breakthroughs in productivity and security that cloud-based applications are uniquely capable of delivering.

This event also marks some major milestones:

• As of today, more than 3 million businesses have gone Google, and over 30 million users within businesses, schools and organizations now depend on our messaging and collaboration tools.
• We’re launching new cloud-powered capabilities: two-step verification to help enhance security and soon, mobile editing in Google Docs on Android and the iPad™.

First, Google Apps Premier, Education and Government Edition administrators can now have users sign in with the combination of their password (something they know) and a one-time verification code provided by a mobile phone (something they have). Users can continue to access Google Apps from Internet-connected devices, but with stronger protections to help fend off risks like phishing scams and password reuse. For the first time, we’re making this technology accessible to organizations large and small without the costs and complexities that have historically limited two-step verification to large enterprises with deep pockets. Furthermore, in the coming months, Standard Edition and hundreds of millions of individual Google users will be able to enjoy this feature as well.


Second, today we demonstrated new mobile editing capabilities for Google Docs on the Android platform and the iPad. In the next few weeks, co-workers around the world will soon be able to co-edit files simultaneously from an even wider array of devices.

Only cloud computing is able to deliver the whole package of productivity-enhancing collaboration, superior reliability and virtually unlimited scale at a price that’s affordable for any size organization. Our Atmosphere event is a nice opportunity to step back and fully appreciate the power of the cloud with customers and future customers alike.

Posted by Dave Girouard, President, Google Enterprise

Simpler sign-ups for Yahoo! users with OpenID

How many times have you created a new account at a website and seen a message that said: “Thank you for creating an account. To activate your new account, please access your email and click the verification URL provided.”

Even though you just want to start using the website, this lengthy process requires you to manually perform a whole bunch of steps—including switching to your mailbox, trying to find the message the website sent you (which might be in your Spam folder), opening the message, clicking the link, etc. Until recently, we also required people to follow these steps if they wanted to sign up for a Google Account using their existing email address, such as a @yahoo.com, @hotmail.com, or other address.

To make this process simpler, we’re now using an Internet standard called OpenID which is supported by several email providers, including Yahoo!. Instead of the process above, Yahoo! users who sign up with Google see the page below with a button that sends them to Yahoo! for verification.

Once you click that button, Yahoo! shows you a page to get your consent to share your email address with Google.

After you agree, you’re done and can start using any Google service, such as Google Groups, Docs, Reader, AdWords, etc. We have found that a much larger number of people complete the email verification process when this method is used.

In the future we hope to expand this feature to other email providers, and we also hope other website operators will read more on the Google Code Blog about how they can implement a similar feature.

Posted by Eric Sachs, Senior Product Manager, Google Security

Search more securely with encrypted Google web search

Update June 25, 2010: Since we introduced our encrypted search option last month, we’ve been listening closely to user feedback. Many users appreciate the capability to perform searches with better protection against snooping from third parties. We’ve also heard about some challenges faced by various school districts, and today, we want to inform you that we’ve moved encrypted search from https://www.google.com to https://encrypted.google.com. The site functions in the same way. For more information on this change, please read on here.

As people spend more time on the Internet, they want greater control over who has access to their online communications. Many Internet services use what are known as Secure Sockets Layer (SSL) connections to encrypt information that travels between your computer and their service. Usually recognized by a web address starting with “https” or a browser lock icon, this technology is regularly used by online banking sites and e-commerce websites. Other sites may also implement SSL in a more limited fashion, for example, to help protect your passwords when you enter your login information.

Years ago Google added SSL encryption to products ranging from Gmail to Google Docs and others, and we continue to enable encryption on more services. Like banking and e-commerce sites, Google’s encryption extends beyond login passwords to the entire service. This session-wide encryption is a significant privacy advantage over systems that only encrypt login pages and credit card information. Early this year, we took an important step forward by making SSL the default setting for all Gmail users. And today we’re gradually rolling out a new choice to search more securely at https://www.google.com.

When you search on https://www.google.com, an encrypted connection is created between your browser and Google. This secured channel helps protect your search terms and your search results pages from being intercepted by a third party on your network. The service includes a modified logo to help indicate that you’re searching using SSL and that you may encounter a somewhat different Google search experience, but as always, remember to check the start of the address bar for “https” and your browser lock indicators:

Today’s release comes with a “beta” label for a few reasons. First, it currently covers only the core Google web search product. To help avoid misunderstanding, when you search using SSL, you won’t see links to offerings like Image Search and Maps that, for the most part, don’t support SSL at this time. Also, since SSL connections require additional time to set up the encryption between your browser and the remote web server, your experience with search over SSL might be slightly slower than your regular Google search experience. What won’t change is that you will still get the same great search results.

A few notes to remember: Google will still maintain search data to improve your search quality and to provide better service. Searching over SSL doesn’t reduce the data sent to Google — it only hides that data from third parties who seek it. And clicking on any of the web results, including Google universal search results for unsupported services like Google Images, could take you out of SSL mode. Our hope is that more websites and services will add support for SSL to help create a better and more consistent experience for you.

We think users will appreciate this new option for searching. It’s a helpful addition to users’ online privacy and security, and we’ll continue to add encryption support for more search offerings. To learn more about using the feature, refer to our help article on search over SSL.

Posted by Evan Roseman, Software Engineer

WiFi data collection: An update

Update June 9, 2010: 

When we announced three weeks ago that we had mistakenly included code in our software that collected samples of payload data from WiFi networks, we said we would ask a third party to review the software at issue, how it worked, and what data it gathered. That report, by the security consulting firm Stroz Friedberg, is now complete and was sent to the interested data protection authorities today. In short, it confirms that Google did indeed collect and store payload data from unencrypted WiFi networks, but not from networks that were encrypted. You can read the report here. We are continuing to work with the relevant authorities to respond to their questions and concerns.

Update May 17, 2010:

On Friday May 14 the Irish Data Protection Authority asked us to delete the payload data we collected in error in Ireland. We can confirm that all data identified as being from Ireland was deleted over the weekend in the presence of an independent third party. We are reaching out to Data Protection Authorities in the other relevant countries about how to dispose of the remaining data as quickly as possible.


You can read the letter from the independent third party, confirming deletion, here.


[original post]
Nine days ago the data protection authority (DPA) in Hamburg, Germany asked to audit the WiFi data that our Street View cars collect for use in location-based products like Google Maps for mobile, which enables people to find local restaurants or get directions. His request prompted us to re-examine everything we have been collecting, and during our review we discovered that a statement made in a blog post on April 27 was incorrect.

In that blog post, and in a technical note sent to data protection authorities the same day, we said that while Google did collect publicly broadcast SSID information (the WiFi network name) and MAC addresses (the unique number given to a device like a WiFi router) using Street View cars, we did not collect payload data (information sent over the network). But it’s now clear that we have been mistakenly collecting samples of payload data from open (i.e. non-password-protected) WiFi networks, even though we never used that data in any Google products.

However, we will typically have collected only fragments of payload data because: our cars are on the move; someone would need to be using the network as a car passed by; and our in-car WiFi equipment automatically changes channels roughly five times a second. In addition, we did not collect information traveling over secure, password-protected WiFi networks.

So how did this happen? Quite simply, it was a mistake. In 2006 an engineer working on an experimental WiFi project wrote a piece of code that sampled all categories of publicly broadcast WiFi data. A year later, when our mobile team started a project to collect basic WiFi network data like SSID information and MAC addresses using Google’s Street View cars, they included that code in their software—although the project leaders did not want, and had no intention of using, payload data.

As soon as we became aware of this problem, we grounded our Street View cars and segregated the data on our network, which we then disconnected to make it inaccessible. We want to delete this data as soon as possible, and are currently reaching out to regulators in the relevant countries about how to quickly dispose of it.

Maintaining people’s trust is crucial to everything we do, and in this case we fell short. So we will be:

• Asking a third party to review the software at issue, how it worked and what data it gathered, as well as to confirm that we deleted the data appropriately; and
• Internally reviewing our procedures to ensure that our controls are sufficiently robust to address these kinds of problems in the future.

In addition, given the concerns raised, we have decided that it’s best to stop our Street View cars collecting WiFi network data entirely.

This incident highlights just how publicly accessible open, non-password-protected WiFi networks are today. Earlier this year, we encrypted Gmail for all our users, and next week we will start offering an encrypted version of Google Search. For other services users can check that pages are encrypted by looking to see whether the URL begins with “https”, rather than just “http”; browsers will generally show a lock icon when the connection is secure. For more information about how to password-protect your network, read this.

The engineering team at Google works hard to earn your trust—and we are acutely aware that we failed badly here. We are profoundly sorry for this error and are determined to learn all the lessons we can from our mistake.

Posted by Alan Eustace, Senior VP, Engineering & Research