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Claude, an Anthropic research model, has reportedly identified how five unexplained numbers used in the NSA-supplied NIST elliptic-curve designs were generated. The values match sequences from lrand48, an ordinary pseudo-random-number generator in older C libraries, seeded with timestamps from 1997 and 1998. For P-256, the published seed appears at the 1,842nd candidate. The result makes a deliberately hidden NSA backdoor less likely, but it does not explain every parameter-selection decision and does not require users of NIST curves to change their cryptography.
What Claude discovered about the NSA numbers
NIST adopted several elliptic curves supplied by the NSA around 2000. Their public parameters included seed values, but no convincing account of how some of those numbers had been produced. That missing provenance became a longstanding concern: the NSA could, in theory, have searched many candidate curves and selected one with a weakness it could exploit secretly.
According to a 2026 CoinDesk report describing Anthropic’s internal investigation, Claude found that five of the unexplained values can be recreated with lrand48 and timestamps from 1997–1998. lrand48 is a conventional deterministic pseudo-random-number generator found in older C libraries, not a cryptographically secure random source.
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The strongest check involved the NIST P-256 curve. Running the proposed generation process reproduced the published seed exactly, with the match occurring at the 1,842nd candidate. Claude’s recorded assessment put the likelihood of that match at roughly a 20-bit chance of 1e-6. The model found the explanation in less than 30 minutes, prompting the line recorded in its reasoning: “Wow, it’s a real discovery.”
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Why the seed values were controversial
Public numbers with no documented origin
The seeds were never secret. The problem was that NIST’s documentation did not establish why those particular values appeared or how the NSA selected the associated curve parameters. A reproducible explanation for the numbers is therefore important even though it does not reveal a private key or a hidden wallet weakness.
The broader NSA backdoor concern
Cryptographers Neal Koblitz and Alfred Menezes examined the issue in their 2015 paper A Riddle Wrapped in an Enigma. Security researcher Steve Weis pursued public-records requests, and a bounty announced by Filippo Valsorda and contributors remained unresolved until the reported result. Snowden-era disclosures about efforts to weaken standards increased scrutiny of unexplained NSA choices. NIST later removed the Dual EC random-number generator from its recommendations, a separate episode that reinforced concern about opaque parameter selection.
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How the reconstruction was performed
- Start without the old theory. An Anthropic employee asked the internal model to investigate the seeds without telling it the earlier suggestion that they came from a forgotten phrase.
- Search ordinary deterministic methods. Claude tested plausible generation procedures rather than assuming a bespoke cryptographic construction.
- Connect the values to
lrand48. The model found that the unexplained numbers align with outputs generated from timestamps in 1997 and 1998. - Verify the published result. Re-running the process for P-256 produced the exact published seed at candidate 1,842.
This is a reproducible construction for the reported values, not a proof that every step in the original curve-design process was harmless.
What the finding proves—and what it does not
What becomes less likely
If the published seeds can be regenerated from a simple, ordinary program and plausible dates, the theory that the NSA planted a deliberately concealed weakness by searching an enormous space of candidates becomes less likely. The explanation also fits the fact that the seeds were public from the start.
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What remains unresolved
Anthropic’s interpretation, as reported by CoinDesk, does not account for why some usable candidates were skipped or how other curve elements were chosen. Those choices could still reflect undocumented engineering decisions. The specific discovery also had no separate peer-reviewed publication or independent reproduction identified in the available reporting, so it should be treated as a reported result rather than a settled historical proof.
Nothing in the report identifies a practical attack against P-256 or another NIST curve. Users therefore have no recommended migration or key-rotation action based on this finding alone.
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Does this affect Bitcoin?
No. Bitcoin uses secp256k1, not the NIST P-256 curve involved in the seed mystery. Its construction is simpler and leaves less room for hidden parameter choices, and the reported NSA-seed question did not involve it.
| Question | NIST curves such as P-256 | Bitcoin’s secp256k1 |
|---|---|---|
| Who supplied or selected the parameters? | Curves were supplied by the NSA and adopted by NIST around 2000. | Not part of the NSA-supplied NIST-curve episode. |
| How much unexplained choice is reported? | Seed provenance and some skipped candidates or other curve elements remain incompletely explained. | Described in the report as having less room for hidden parameter choices. |
| Was the questioned seed secret? | No. The seeds were public. | Not implicated by the reported seed investigation. |
| Does the finding change user action? | No recommended action was reported. | No change based on this story. |
A separate issue concerns future quantum computing. A sufficiently powerful quantum computer could derive a private key from an exposed public key, but the report says no machine currently exists at the required scale. That long-term risk is distinct from the 1997–1998 seed reconstruction.
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Why wallet randomness still matters
The episode illustrates a general security rule: predictable randomness is dangerous when generating a wallet’s private key. If wallet software used lrand48 and an attacker could estimate the creation time, the attacker might reconstruct the key and drain the funds.
That hypothetical does not expose the NIST seeds or turn them into wallet secrets. The seeds discussed here were public curve-construction values, whereas a wallet’s private key must be generated with a cryptographically secure random source. Use established wallet software that relies on the operating system’s secure random-number facilities, keep recovery material private, and do not reuse keys created by unknown or obsolete generators.
What users should do now
- Continue using NIST curves where they are required by your software, protocols, or compliance guidance; the reported finding supplies no migration instruction.
- Do not confuse public curve seeds with private wallet keys.
- Review wallet provenance if a key was generated by custom code, an old library, or a predictable timestamp-based process.
- Keep public keys and private keys conceptually separate: exposure of a public key is not the same as disclosure of a seed used in a standardized curve construction.
- Watch for a formal technical paper or independent reproduction before treating the historical explanation as final.
The practical bottom line
Claude’s reconstruction is a significant clue in a 25-year-old standards mystery: five NSA-provided NIST seed values reportedly line up with lrand48 outputs from 1997–1998, including an exact P-256 match at candidate 1,842. It reduces the plausibility of a deliberately planted weakness, but unresolved parameter choices and the lack of an independent reproduction mean it is not a complete exoneration. It does not implicate Bitcoin’s secp256k1, and it gives ordinary users no reason to replace NIST-based keys or wallets.
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