Wednesday, January 9, 2019

Diffie Hellman key size (cisco ios SSH)

Ran the command:

crypto key generate rsa general-keys modulus 2048

But I'm still seeing a 1024 key, anyone know why this is?

SSH Enabled - version 2.0 Authentication timeout: 120 secs; Authentication retries: 3

Minimum expected Diffie Hellman key size : 1024 bits

IOS Keys in SECSH format(ssh-rsa, base64 encoded):

EDIT:

Figured out my problem, needed this command:

ip ssh dh min size 2048



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