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The Obama administration has been tightlipped about its controversial naming of the North Korean government as the definitive source of the hack that eviscerated Sony Pictures Entertainment late last year. But FBI director James Comey is standing by the bureau’s conclusion, and has offered up a few tiny breadcrumbs of the evidence that led to it. Those crumbs include the claim that Sony hackers sometimes failed to use the proxy servers that masked the origin of their attack, revealing IP addresses that the FBI says were used exclusively by North Korea. Speaking at a Fordham Law School cybersecurity conference Wednesday, Comey said that he has “very high confidence” in the FBI’s attribution of the attack to North Korea. And he named several of the sources of his evidence, including a “behavioral analysis unit” of FBI experts trained to psychologically analyze foes based on their writings and actions. He also said that the FBI compared the Sony attack with their own “red team” simulations to determine how the attack could have occurred. And perhaps most importantly, Comey now says that the hackers in the attack failed on multiple occasions to use the proxy servers that bounce their Internet connection through an obfuscating computer somewhere else in the world, revealing IP addresses that tied them to North Koreans.

“In nearly every case, [the Sony hackers known as the Guardians of Peace] used proxy servers to disguise where they were coming from in sending these emails and posting these statements. But several times they got sloppy,” Comey said. “Several times, either because they forgot or because of a technical problem, they connected directly and we could see that the IPs they were using…were exclusively used by the North Koreans.” “They shut it off very quickly once they saw the mistake,” he added. “But not before we saw where it was coming from.” Comey’s brief and cryptic remarks—with no opportunity for followup questions from reporters—respond to skepticism and calls for more evidence from cybersecurity experts unsatisfied with the FBI’s vague statements tying the hack to North Korean government. In a previous public announcement the FBI had said only that it found “similarities in specific lines of code, encryption algorithms, data deletion methods, and compromised networks,” as well as IP addresses that matched prior attacks it knows to have originated in North Korea. At that time, the FBI also said it had further evidence matching the tools used in the attack to a North Korean hacking attack that hit South Korean banks and media outlets.

Following those elliptical statements, the cybersecurity community demanded more information be released to prove North Korea’s involvement. Some have even signed a petition on the White House website calling for more transparency in the investigation. Well-known security blogger and author Bruce Schneier has compared the FBI’s “trust us” mentality to the claims of the Bush administration about Saddam Hussein’s nonexistent weapons of mass destruction in the run-up to the Iraq War. Without more information, security experts themselves have remained deeply divided in their conclusions about who hacked Sony.

The NSA and Britain's GCHQ hacked the world's biggest SIM card maker to harvest the encryption keys needed to silently and effortlessly eavesdrop on potentially millions of people. That's according to documents obtained by surveillance whistleblower Edward Snowden and leaked to the web on Thursday. "Wow. This is huge – it's one of the most significant findings of the Snowden files so far," computer security guru Bruce Schneier told The Register this afternoon. "We always knew that they would occasionally steal SIM keys. But all of them? The odds that they just attacked this one firm are extraordinarily low and we know the NSA does like to steal keys where it can." The damning slides, published by Snowden's chums at The Intercept, detail the activities of the as-yet unheard-of Mobile Handset Exploitation Team (MHET), run by the US and UK. The group targeted Gemalto, which churns out about two billion SIM cards each year for use around the world, and targeted it in an operation dubbed DAPINO GAMMA.

Gemalto's hacking may also bring into question some of its other security products as well. The company supplies chips for electronic passports issued by the US, Singapore, India, and many European states, and is also involved in the NFC and mobile banking sector. It's important to note that this is useful for tracking the phone activity of a target, but the mobile user can still use encryption on the handset itself to ensure that some communications remain private. "Ironically one of your best defenses against a hijacked SIM is to use software encryption," Jon Callas, CTO of encrypted chat biz Silent Circle told The Register. "In our case there's a TCP/IP cloud between Alice and Bob and that can deal with compromised routers along the path as well as SIM issues, and the same applies to similar mobile software."

On Wednesday the UK government admitted that its intelligence agencies had in fact broken the ECHR when spying on communications between lawyers and those suing the British state, so GCHQ might want to reconsider that statement.