# Questions tagged [ed448]

In cryptography, Curve448 or Curve448-Goldilocks is an elliptic curve potentially offering 224 bits of security and designed for use with the elliptic-curve Diffie–Hellman (ECDH) key agreement scheme.

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### Curve448 - Can Ed448 key material be reused for X448?

Currently I am facing a situation in which Ed448 key pairs (private + public key) are available and the system should be extended by a Diffie-Hellman (ECDH) operation. First of let me summarize what I ...
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### Why does EDDSA secret scaler pruning not prevent values >= prime L or zero?

I have been exploring and studying the EDDSA algorithm for curve 25519 and curve 448 in RFC 8032 (https://www.rfc-editor.org/rfc/rfc8032) as well as for curves 414 and 521 from this (https://eprint....
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### Public key derivation for Ed448

Another potentially silly question here, but I seem to have developed tunnel vision and I am missing something very basic. In RFC 8032 one can find a number of test vectors for Ed488 - for example: <...
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### Order of Edwards curve and its twist

In Mike Hamburg's Ed448-Goldilocks, a new elliptic curve (eprint 2015, WECCS 2015) it is studied untwisted Edwards curves in the prime field $\mathbb F_p$ $$E_d:\,y^2+x^2\,=\,1+d\,x^2\,y^2$$ with ...
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### Performing EdDSA/Ed448 employing Montgomery ladder

EdDSA can be efficiently performed employing the Montgomery ladder. In order to implement this method, the base point should be converted to Mont. space, then the Mont. ladder should be executed, and ...
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