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Google Online Security Blog: November 2011
Security Blog
The latest news and insights from Google on security and safety on the Internet
Reminder: Safe Browsing version 1 API turning down December 1
November 22, 2011
Posted by Brian Ryner, Security Team
In May we
announced
that we are ending support for the Safe Browsing protocol version 1 on December 1 in order to focus our resources on the
new version 2 API
and the
lookup service
. These new APIs provide simpler and more efficient access to the same data, and they use significantly less bandwidth. If you haven't yet migrated off of the version 1 API, we encourage you to do so as soon as possible. Our
earlier post
contains links to documentation for the new protocol version and other resources to help you make the transition smoothly.
After December 1, we will remove all data from the version 1 API list to ensure that any remaining clients do not have false positives in their database. After January 1, 2012, we will turn off the version 1 service completely, and all requests will return a 404 error.
Thanks for your cooperation, and enjoy using the next generation of Safe Browsing.
Protecting data for the long term with forward secrecy
November 22, 2011
Posted by Adam Langley, Security Team
Last year we introduced
HTTPS by default for Gmail
and
encrypted search
. We’re pleased to see that other major communications sites are following suit and deploying HTTPS in one form or another. We are now pushing forward by enabling
forward secrecy
by default.
Most major sites supporting HTTPS operate in a non-forward secret fashion, which runs the risk of retrospective decryption. In other words, an encrypted, unreadable email could be recorded while being delivered to your computer today. In ten years time, when computers are much faster, an adversary could break the server private key and retrospectively decrypt today’s email traffic.
Forward secrecy requires that the private keys for a connection are not kept in persistent storage. An adversary that breaks a single key will no longer be able to decrypt months’ worth of connections; in fact, not even the server operator will be able to retroactively decrypt HTTPS sessions.
Forward secret HTTPS is now live for Gmail and many other Google HTTPS services(*), like SSL Search, Docs and Google+. We have also
released the work
that we did on the open source OpenSSL library that made this possible. You can check whether you have forward secret connections in Chrome by clicking on the green padlock in the address bar of HTTPS sites. Google’s forward secret connections will have a key exchange mechanism of ECDHE_RSA.
We would very much like to see forward secrecy become the norm and hope that our deployment serves as a demonstration of the practicality of that vision.
(* Chrome, Firefox (all platforms) and Internet Explorer (Vista or later) support forward secrecy using elliptic curve Diffie-Hellman. Initially, only Chrome and Firefox will use it by default with Google services because IE doesn’t support the combination of ECDHE and RC4. We hope to support IE in the future.)
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