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In a post on Wednesday, researchers Alex Halderman and Nadia Heninger presented compelling research suggesting that the NSA has developed the capability to decrypt a large number of HTTPS, SSH, and VPN connections using an attack on common implementations of the Diffie-Hellman key exchange algorithm with 1024-bit primes. Earlier in the year, they were part of a research group that published a study of the Logjam attack, which leveraged overlooked and outdated code to enforce "export-grade" (downgraded, 512-bit) parameters for Diffie-Hellman. By performing a cost analysis of the algorithm with stronger 1024-bit parameters and comparing that with what we know of the NSA "black budget" (and reading between the lines of several leaked documents about NSA interception capabilities) they concluded that it's likely NSA has been breaking 1024-bit Diffie-Hellman for some time now. The good news is, in the time since this research was originally published, the major browser vendors (IE, Chrome, and Firefox) have removed support for 512-bit Diffie-Hellman, addressing the biggest vulnerability. However, 1024-bit Diffie-Hellman remains supported for the forseeable future despite its vulnerability to NSA surveillance. In this post, we present some practical tips to protect yourself from the surveillance machine, whether you're using a web browser, an SSH client, or VPN software. Disclaimer: This is not a complete guide, and not all software is covered.

A week ago, we saw a procession of nervous headlines after the Times and then Bloomberg reported that Facebook, its messaging platform WhatsApp and others would now be forced to disclose encrypted messages to law enforcement agencies under a new treaty between the U.S. and the U.K. As I commented at the time, these reports were misleading, mixing up agreements to share data that already exists with changes in the law to break encryption. But now the U.S. and U.K., as well as Australia, are set to write to Facebook to request that the company pauses its plans for cross-platform messaging encryption until backdoors can be added, citing public safety and serious crime as its reasons.EFF described the letter as an “all-out attack on encryption... a staggering attempt to undermine the security and privacy of communications tools used by billions of people,” and urged Facebook not to comply. The organization warned that the move would endanger activists and journalists, and could be used by “authoritarian regimes... to spy on dissidents in the name of combatting terrorism or civil unrest.”