Security Blog
The latest news and insights from Google on security and safety on the Internet
Speeding up and strengthening HTTPS connections for Chrome on Android
2014年4月24日
Posted by Elie Bursztein, Anti-Abuse Research Lead
Earlier this year, we deployed a new TLS cipher suite in Chrome that operates three times faster than AES-GCM on devices that don’t have AES hardware acceleration, including most Android phones, wearable devices such as Google Glass and older computers. This improves user experience, reducing latency and saving battery life by cutting down the amount of time spent encrypting and decrypting data.
To make this happen, Adam Langley, Wan-Teh Chang, Ben Laurie and I began implementing new algorithms -- ChaCha 20 for symmetric encryption and Poly1305 for authentication -- in OpenSSL and NSS in March 2013. It was a complex effort that required implementing a new abstraction layer in OpenSSL in order to support the Authenticated Encryption with Associated Data (AEAD) encryption mode properly. AEAD enables encryption and authentication to happen concurrently, making it easier to use and optimize than older, commonly-used modes such as CBC. Moreover,
recent attacks
against RC4 and CBC also prompted us to make this change.
The benefits of this new cipher suite include:
Better security: ChaCha20 is immune to padding-oracle attacks, such as the Lucky13, which affect CBC mode as used in TLS. By design, ChaCha20 is also immune to timing attacks. Check out a detailed description of TLS ciphersuites weaknesses in our earlier
post
.
Better performance: ChaCha20 and Poly1305 are very fast on mobile and wearable devices, as their designs are able to leverage common CPU instructions, including ARM vector instructions. Poly1305 also saves network bandwidth, since its output is only 16 bytes compared to HMAC-SHA1, which is 20 bytes. This represents a 16% reduction of the TLS network overhead incurred when using older ciphersuites such as RC4-SHA or AES-SHA. The expected acceleration compared to AES-GCM for various platforms is summarized in the chart below.
As of February 2014, almost all HTTPS connections made from Chrome browsers on Android devices to Google properties have used this new cipher suite. We plan to make it available as part of the Android platform in a future release. If you’d like to verify which cipher suite Chrome is currently using, on an Android device or on desktop, just click on the padlock in the URL bar and look at the connection tab. If Chrome is using ChaCha20-Poly1305 you will see the following information:
ChaCha20 and Poly1305 were designed by Prof. Dan Bernstein from the University of Illinois at Chicago. The simple and efficient design of these algorithms combined with the extensive vetting they received from the scientific community make us confident that these algorithms will bring the security and speed needed to secure mobile communication. Moreover, selecting algorithms that are free for everyone to use is also in line with our commitment to openness and transparency.
We would like to thank the people who made this possible: Dan Bernstein who invented and implemented both ChaCha/20 and Poly1305, Andrew Moon for his open-source implementation of Poly1305, Ted Krovetz for his open-source implementation of ChaCha20 and Peter Schwabe for his implementation work. We hope there will be even
greater adoption
of this cipher suite, and look forward to seeing other websites deprecate AES-SHA1 and RC4-SHA1 in favor of AES-GCM and ChaCha20-Poly1305 since they offer safer and faster alternatives. IETF draft standards for this cipher suite are available
here
and
here
.
New Security Measures Will Affect Older (non-OAuth 2.0) Applications
2014年4月23日
Posted by Antonio Fuentes, Product Manager, Google Identity Team
There is nothing more important than making sure our users and their information stay safe online. Doing that means providing security features at the user-level like 2-Step Verification and recovery options, and also involves a lot of work behind the scenes, both at Google and with developers like you. We've already implemented developer tools including
Google Sign-In
and support for
OAuth 2.0 in Google APIs
and IMAP, SMTP and XMPP, and we’re always looking to raise the bar.
That's why, beginning in the second half of 2014, we'll start gradually increasing the security checks performed when users log in to Google. These additional checks will ensure that only the intended user has access to their account, whether through a browser, device or application. These changes will affect any application that sends a username and/or password to Google.
To better protect your users, we recommend you upgrade all of your applications to OAuth 2.0. If you choose not to do so, your users will be required to take extra steps in order to keep accessing your applications.
The standard Internet protocols we support all work with OAuth 2.0, as do most of our APIs. We leverage the work done by the IETF on OAuth 2.0 integration with IMAP, SMTP, POP, XMPP, CalDAV, and CardDAV.
In summary, if your application currently uses plain passwords to authenticate to Google, we strongly encourage you to minimize user disruption by switching to
OAuth 2.0
.
Street View and reCAPTCHA technology just got smarter
2014年4月16日
Posted by Vinay Shet, Product Manager, reCAPTCHA
Have you ever wondered how Google Maps knows the exact location of your neighborhood coffee shop? Or of the hotel you’re staying at next month? Translating a street address to an exact location on a map is harder than it seems. To take on this challenge and make Google Maps even more useful, we’ve been working on a new system to help locate addresses even more accurately, using some of the technology from the Street View and reCAPTCHA teams.
This technology finds and reads street numbers in Street View, and correlates those numbers with existing addresses to pinpoint their exact location on Google Maps. We’ve described these findings in a
scientific paper
at the
International Conference on Learning Representations (ICLR)
. In this paper, we show that this system is able to accurately detect and read difficult numbers in Street View with 90% accuracy.
Street View numbers correctly identified by the algorithm
These findings have surprising implications for spam and abuse protection on the Internet as well. For more than a decade,
CAPTCHAs
have used visual puzzles in the form of distorted text to help webmasters prevent automated software from engaging in abusive activities on their sites. Turns out that this new algorithm can also be used to read CAPTCHA puzzles—we found that it can decipher the hardest distorted text puzzles from reCAPTCHA with over 99% accuracy. This shows that the act of typing in the answer to a distorted image should not be the only factor when it comes to determining a human versus a machine.
Fortunately, Google’s reCAPTCHA has taken this into consideration, and reCAPTCHA is more secure today than ever before. Last year, we
announced
that we’ve significantly reduced our dependence on text distortions as the main differentiator between human and machine, and instead perform advanced risk analysis. This has also allowed us to simplify both our text CAPTCHAs as well as our audio CAPTCHAs, so that getting through this security measure is easy for humans, but still keeps websites protected.
CAPTCHA images correctly solved by the algorithm
Thanks to this research, we know that relying on distorted text alone isn’t enough. However, it’s important to note that simply identifying the text in CAPTCHA puzzles correctly doesn’t mean that reCAPTCHA itself is broken or ineffective. On the contrary, these findings have helped us build additional safeguards against bad actors in reCAPTCHA.
As the Street View and reCAPTCHA teams continue to work closely together, both will continue to improve, making Maps more precise and useful and reCAPTCHA safer and more effective. For more information, check out the
reCAPTCHA site
and the
scientific paper
from
ICLR 2014
.
Google Services Updated to Address OpenSSL CVE-2014-0160 (the Heartbleed bug)
2014年4月9日
Posted by Matthew O'Connor, Product Manager
You may have heard of “Heartbleed,” a flaw in OpenSSL that could allow the theft of data normally protected by SSL/TLS encryption.
We’ve assessed this vulnerability and applied patches to key Google services such as Search, Gmail, YouTube, Wallet, Play, Drive, Apps, App Engine,
AdWords, DoubleClick, Maps, Maps Engine, Earth, Analytics and Tag Manager
. Google Chrome and Chrome OS are not affected.
We are still working to patch some other Google services. We regularly and proactively look for vulnerabilities like this --
and encourage others to report them
-- so that that we can fix software flaws before they are exploited.
If you are a Google Cloud Platform or Google Search Appliance customer, or don’t use the latest version of Android, here is what you need to know:
Cloud SQL
We are currently patching Cloud SQL, with the patch rolling out to all instances today and tomorrow. In the meantime, users should use the IP whitelisting function to ensure that only known hosts can access their instances. Please find
instructions here
.
Google Compute Engine
Customers need to manually update OpenSSL on each running instance or should replace any existing images with versions including an updated OpenSSL. Once updated, each instance should be rebooted to ensure all running processes are using the updated SSL library. Please find
instructions here
.
Google Search Appliance (GSA)
Engineers have patched GSA and issued notices to customers. More information is available in the
Google Enterprise Support Portal
.
Android
All versions of Android are immune to CVE-2014-0160 (with the limited exception of Android 4.1.1; patching information for Android 4.1.1 is being distributed to Android partners).
We will continue working closely with the security research and open source communities, as doing so is one of the best ways we know to keep our users safe.
Apr 12
: Updated to add Google AdWords, DoubleClick, Maps, Maps Engine and Earth to the list of Google services that were patched early, but inadvertently left out at the time of original posting.
Apr 14
: In light of new research on extracting keys using the Heartbleed bug, we are recommending that Google Compute Engine (GCE) customers create new keys for any affected SSL services. Google Search Appliance (GSA) customers should also consider creating new keys after patching their GSA. Engineers are working on a patch for the GSA, and the
Google Enterprise Support Portal
will be updated with the patch as soon as it is available.
Also updated to add Google Analytics and Tag Manager to the list of Google services that were patched early, but inadvertently left out at the time of original posting.
Apr 16:
Updated to include information about GSA patch.
Apr 28:
Updated to add Google Drive, which was patched early but inadvertently left out at the time of original posting.
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