Curve25519, designed by Prof. Dan Bernstein, is one of the two curves selected by the CFRG for recommendation. When compared to P-256, the most commonly used curve in TLS today, it admits simpler, faster implementations that are more naturally resistant to side-channels. In Chrome 50, we will be adding support for X25519, the Diffie-Hellman primitive over curve25519, to TLS.


Specification link

Specification being incubated in a Community Group

Status in Chromium


Enabled by default (tracking bug)

Consensus & Standardization

After a feature ships in Chrome, the values listed here are not guaranteed to be up to date.

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Search tags

tls, ssl, curve25519, x25519,

Last updated on 2021-10-04