The NSA backdoor controversy originated in the late 1990s, when the agency supplied cryptographic parameters to the U.S. government without disclosing how certain values were generated. NIST adopted the elliptic curves in 2000, raising concerns that the unexplained numbers might have been selected to introduce a hidden security flaw.

Suspicion increased following Edward Snowden’s 2013 revelations about the NSA’s cryptographic activities. Researchers spent years trying to uncover the source of the numbers, but the mystery remained unresolved.

In October 2026, Anthropic’s Claude AI model reportedly traced the values to lrand48, a standard random-number generator initialized with timestamps from 1997 and 1998. The finding offers a verifiable explanation for the numbers and reduces the likelihood that they were deliberately chosen to conceal a backdoor, although the NSA’s original motives remain uncertain.

Bitcoin was not affected by this particular controversy because it uses the secp256k1 curve instead of NIST’s P-256. However, Bitcoin faces a separate potential risk from advances in quantum computing, as sufficiently powerful machines could eventually compromise the cryptographic keys protecting its wallets.