Key exchange method (KEX)

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wikipedia:Key exchange method

OpenSSH changelog[edit]

ssh -V
OpenSSH_8.2p1 Ubuntu-4ubuntu0.2, OpenSSL 1.1.1f  31 Mar 2020
ssh -o PreferredAuthentications=keyboard-interactive -o PubkeyAuthentication=no [email protected]
Unable to negotiate with port 22: no matching key exchange method found. Their offer: diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1

ssh -oKexAlgorithms=+diffie-hellman-group1-sha1
ssh_dispatch_run_fatal: Connection to port 22: Invalid key length

Cisco IOS[edit]

show ip ssh

KEX Algorithms:diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha1

Related terms[edit]

See also[edit]