Salt Typhoon Hack Shows There's No Security Backdoor That's Only For The “Good Guys”

At EFF, we've long noted that you cannot build a backdoor that only lets in good guys and not bad guys. Over the weekend, we saw another example of this: The Wall Street Journal reported on a major breach of U.S. telecom systems attributed to a sophisticated Chinese-government backed hacking group dubbed Salt Typhoon.

According to reports, the hack took advantage of systems built by ISPs like Verizon, AT&T, and Lumen Technologies (formerly CenturyLink) to give law enforcement and intelligence agencies access to the ISPs' user data. This gave China unprecedented access to data related to U.S. government requests to these major telecommunications companies. It's still unclear how much communication and internet traffic, and related to whom, Salt Typhoon accessed.

That's right: the path for law enforcement access set up by these companies was apparently compromised and used by China-backed hackers. That path was likely created to facilitate smooth compliance with wrong-headed laws like CALEA, which require telecommunications companies to facilitate “lawful intercepts” — in other words, wiretaps and other orders by law enforcement and national security agencies. While this is a terrible outcome for user privacy, and for U.S. government intelligence and law enforcement, it is not surprising.

The idea that only authorized government agencies would ever use these channels for acquiring user data was always risky and flawed. We've seen this before: in a notorious case in 2004 and 2005, more than 100 top officials in the Greek government were illegally surveilled for a period of ten months when unknown parties broke into Greece's “lawful access” program. In 2024, with growing numbers of sophisticated state-sponsored hacking groups operating, it's almost inevitable that these types of damaging breaches occur. The system of special law enforcement access that was set up for the “good guys” isn't making us safer; it's a dangerous security flaw.

Internet Wiretaps Have Always Been A Bad Idea

Passed in 1994, CALEA requires that makers of telecommunications equipment provide the ability for government eavesdropping. In 2004, the government dramatically expanded this wiretap mandate to include internet access providers. EFF opposed this expansion and explained the perils of wiretapping the internet.

The internet is different from the phone system in critical ways, making it more vulnerable. The internet is open and ever-changing. “Many of the technologies currently used to create wiretap-friendly computer networks make the people on those networks more pregnable to attackers who want to steal their data or personal information,” EFF wrote, nearly 20 years ago.

Towards Transparency And Security

The irony should be lost on no one that now the Chinese government may be in possession of more knowledge about whom the U.S. government spies on, including people living in the U.S., than Americans. The intelligence and law enforcement agencies that use these backdoor legal authorities are notoriously secretive, making oversight difficult.

Companies and people who are building communication tools should be aware of these flaws and implement, where possible, privacy by default. As bad as this hack was, it could have been much worse if it wasn't for the hard work of EFF and other privacy advocates making sure that more than 90% of web traffic is encrypted via HTTPS. For those hosting the 10% (or so) of the web that has yet to encrypt its traffic, now is a great time to consider turning on encryption, either using Certbot or switching to a hosting provider that offers HTTPS by default.

What can we do next? We must demand real privacy and security.

That means we must reject the loud law enforcement and other voices that continue to pretend that there are “good guy only” ways to ensure access. We can point to this example, among many others, to push back on the idea that the default in the digital world is that governments (and malicious hackers) should be able to access all of our messages and files. We'll continue to fight against US bills like EARN IT, the EU “Chat Control” file-scanning proposal, and the UK's Online Safety Act, all of which are based on this flawed premise.

It's time for U.S. policymakers to step up, too. If they care about China and other foreign countries engaging in espionage on U.S. citizens, it's time to speak up in favor of encryption by default. If they don't want to see bad actors take advantage of their constituents, domestic companies, or security agencies, again — speak up for encryption by default. Elected officials can and have done so in the past. Instead of holding hearings that give the FBI a platform to make digital wiretaps easier, demand accountability for the digital lock-breaking they're already doing.

The lesson will be repeated until it is learned: there is no backdoor that only lets in good guys and keeps out bad guys. It's time for all of us to recognize this, and take steps to ensure real security and privacy for all of us.