OpenSSH 5.7 released
OpenSSH 5.7 has just been released. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation and includes sftp client and server support.
Changes since OpenSSH 5.6
Only the mandatory sections of RFC5656 are implemented, specifically the three REQUIRED curves nistp256, nistp384 and nistp521 and only ECDH and ECDSA. Point compression (optional in RFC5656) is NOT implemented.
Certificate host and user keys using the new ECDSA key types are supported - an ECDSA key may be certified, and an ECDSA key may act as a CA to sign certificates.
ECDH in a 256 bit curve field is the preferred key agreement algorithm when both the client and server support it. ECDSA host keys are preferred when learning a host’s keys for the first time, or can be learned using ssh-keyscan(1).