SSH Protocol v.2 protocol start


Server and client exchange banners

Client and server both send MSG_KEXINIT packet
Random nonce
Supported/Allowed algorithms to use for key exchange
Supported/Allowed server host key formats
Supported/Allowed symmetric algorithms (both ways)
Supported/Allowed MAC algorithms
Supported/Allowed compression algorithms
Supported/Allowed languages
Flag indicating "KEX guess"

The suppored/allowed lists are comma-separated strings
E.g. "aes128-cbc, 3des-cbc, arcfour"