DoubleChecks

What was claimed

Claude solved a 25-year-old NSA cryptography mystery (P-256 curve seeds) in under 30 minutes that humans and bounties couldn't crack for years

Our verdict

Accurate

Reports say Claude identified a reproducible origin for the P-256 seed and other NIST curve seeds, addressing a decades-old provenance mystery.

Combined assessment16 sourcesChecked Oct 19, 2026

Why this verdict

  • Humans and bounties could not crack the mystery for years.

    Misleading
    Two assessments reached this conclusion; one differed·Claude: Verified

  • Claude did this in under 30 minutes.

    Verified
    All assessments reached this conclusion

  • Claude solved a 25-year-old NSA cryptography mystery involving P-256 curve seeds.

    Verified
    All assessments reached this conclusion

Evidence reviewed

16 sources

Perplexity, Claude and ChatGPT sources are combined here.

pro.edgex.exchangethecurrencyanalytics.comnews.bitcoin.combitget.comchaincatcher.comfinance.biggo.comcyberpress.orgcointribune.comcryptonews.netynetnews.com

Individual assessments

Assessment summary

  • The core event is supported by multiple reports: Anthropic said Claude traced the P-256 and four other NIST curve seeds to lrand48 runs using 1997–1998 timestamps in under 30 minutes pro.edgex.exchange bitget.com.
  • However, the wording overstates certainty: available reporting describes this as Anthropic’s claimed reconstruction, independently reproduced by Filippo Valsorda, not conclusively proven that Claude alone solved a mystery that all humans and bounties could not crack ynetnews.com.

Claims reviewed

Humans and bounties could not crack the mystery for years.

Misleading
The mystery had persisted for decades, but the broad claim that humans and bounties specifically failed to crack it is not established by the available sources. The result was also independently reproduced by a human researcher, Filippo Valsorda ynetnews.com.

This claim may mislead readers without added context.

Claude solved a 25-year-old NSA cryptography mystery involving P-256 curve seeds.

Verified
Reports say Claude identified a reproducible origin for the P-256 seed and other NIST curve seeds, addressing a decades-old provenance mystery pro.edgex.exchange bitget.com.

Claude did this in under 30 minutes.

Verified
Anthropic’s reported account and multiple contemporaneous reports place the model’s work at less than 30 minutes pro.edgex.exchange thecurrencyanalytics.com.

Assessment summary

  • The claim is factually accurate.
  • Claude did solve a 25-year-old NSA cryptography mystery involving P-256 and other NIST curve seeds in under 30 minutes, and a bounty had gone unclaimed for years before this breakthrough.
  • All key facts are supported by recent reporting from October 2026.

Claims reviewed

Humans and bounties couldn't crack it for years

Verified
A $12,288 bounty was launched in October 2023 and remained unclaimed for approximately three years until Claude solved it in October 2026. Cryptographers had been unable to solve it for 25 years.

Claude solved a 25-year-old NSA cryptography mystery

Verified
Multiple sources confirm Anthropic's Claude traced NSA-supplied NIST curve seeds to their origin, solving a mystery that had persisted for approximately 25 years since the late 1990s.

The mystery involved P-256 curve seeds

Verified
P-256 was one of five NIST curves (P-192, P-224, P-256, P-384, P-521) whose seeds were explained. P-256 was particularly prominent in the solution.

Assessment summary

Anthropic reports that an internal Claude model reconstructed the NIST/NSA P-256 (and other) curve seeds and published reproducible code, and independent experts verified the method.anthropic.com coindesk.com Anthropic says the model reached those results in under 30 minutes.anthropic.com The statement that “humans and bounties couldn't crack [it] for years” is vague and unsupported as stated, so that part is at best misleading or unverified.cellcog.ai

Claims reviewed

Humans and bounties couldn't crack it for years.

Misleading
Cryptographers debated the origin for decades and many attempts existed, but the blanket claim about 'humans and bounties' failing is vague and lacks specific evidence about bounty programs or exhaustive human efforts that attempted this exact attack. eprint.iacr.org

This claim may mislead readers without added context.

Claude did it in under 30 minutes.

Verified
Anthropic states the internal research Claude model produced the result in under 30 minutes; media reporting repeats that timing. anthropic.com cellcog.ai

Claude solved the P-256 / NIST elliptic-curve seed mystery.

Verified
Anthropic published research showing an internal Claude model traced the published NIST/NSA curve seeds to lrand48() runs seeded by 1997–1998 Unix timestamps, and third parties reproduced/confirmed the technique. anthropic.com coindesk.com

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