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.