Connect to a server using OpenSSH_5.9p1 OpenSSL 1.0.1, and it stores a .ssh/known_hosts that's of the format:
|1|wwwwwwwwwwwwwww=|wwwwwwwwww= ecdsa-sha2-nistp256 AAAAAAAAAA+AAAAA=
Then copy that known_hosts file to another PC running OpenSSH_4.5p1 OpenSSL 0.9.8d, and it gives the "authenticity can't be established, are you sure you want to continue connecting" message, as if the known_hosts file was't right.
When that second PC stores the known_hosts for the same server, it writes it in the format:
[10.2.3.4]:22 ssh-rsa AAAAAAAAAA/BBBBB/CCCCCC//DDDDDD
Is there a way to convert between the two formats?
Best Answer
Your first example contains an ECDSA key (
ecdsa-sha2-nistp256), which were introduced in OpenSSH 5.7.OpenSSH 4.5 only supports RSA and DSA keys (
ssh-rsaandssh-dss), and ignores your known_hosts entry.