Ed25519

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Ed25519 is a particular implementation of Elliptic Curve Digital Signature Algorithm (ECDSA) on a particular elliptic curve over a particular finite field, uniquely specified for the purpose, and named “Curve25519.”

It is described perhaps most definitively on its author’s homepage, https://ed25519.cr.yp.to/, last updated 2017.01.22. Schneier[1][2] feels that some of these schemes are overspecified, and possibly backdoored by the NSA. For that matter we could just as easily pull a CIA factbook on the Tonga, official registrant of the .to top level country code domain.

  1. ↑ Bruce Schneier. “Bounty to Recover NIST’s Elliptic Curve Seeds.” Schneier on Security, Oct 12, 2023.
  2. ↑ Filippo Valsorda. “Announcing the $12K NIST elliptic curve seeds bounty.” Cryptography Dispatches, Oct 5, 2023.