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Cryptologist DJB Alleges NSA is Pushing an End to Backup Algorithms for Post-Quantum Cryptography

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2 weeks ago
Cryptologist/CS professor Daniel J. Bernstein is alleging that America's National Security Agency is attempting to influence NIST post-quantum cryptography standards. Bernstein first emphasizes that it's normal for post-quantum cryptography (or "PQ") to be part of "hybrid" security that also includes traditional pre-quantum cryptography. (Bernstein says this is important because since 2016, "We've seen many breaks of post-quantum proposals...") "The problem in a nutshell. Surveillance agency NSA and its [UK counterpart] GCHQ are trying to have standards-development organizations endorse weakening [pre-quantum] ECC+PQ down to just PQ." Part of this is that NSA and GCHQ have been endlessly repeating arguments that this weakening is a good thing... I'm instead looking at how easy it is for NSA to simply spend money to corrupt the standardization process.... The massive U.S. military budget now publicly requires cryptographic "components" to have NSA approval... In June 2024, NSA's William Layton wrote that "we do not anticipate supporting hybrid in national security systems"... [Later a Cisco employee wrote of selling non-hybrid cryptography to a significant customer, "that's what they're willing to buy. Hence, Cisco will implement it".] What do you do with your control over the U.S. military budget? That's another opportunity to "shape the worldwide commercial cryptography marketplace". You can tell people that you won't authorize purchasing double encryption. You can even follow through on having the military publicly purchase single encryption. Meanwhile you quietly spend a negligible amount of money on an independent encryption layer to protect the data that you care about, so you're actually using double encryption. This seems to be a speculative scenario. But Bernstein is also concerned about how the Internet Engineering Task Force handled two drafts specifying post-quantum encryption mechanisms for TLS ("the security layer inside HTTPS and inside various other protocols"). For a draft suggesting "non-hybrid" encryption, there were 20 statements of support (plus 2 more only conditionally supporting it), but 7 more statements unequivocally opposing adoption, including one from Bernstein. The IETF has at times said they aim for "rough consensus" — or for "broad consensus" — but Bernstein insists 7 opposers in a field of 29 (24.13%) can't be said to match the legal definition of consensus (which is "general agreement"). "I've filed a formal complaint regarding the claim of consensus to adopt." He's also written a second blog post analyzing the IETF's decision-making process in detail. "It's already bad that the IETF TLS working group adopted non-hybrid post-quantum encryption without official answers to the objections that were raised. It's much worse if the objections can't be raised in the first place." Thanks to alanw (Slashdot reader #1,822) for spotting the blog posts.

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