What is the minimum recommended crypto key setting?

tommy_steele — Wed, 02 Nov 2022 13:09:25 GMT

I've configured "crypto key gen" which generates a 1024 DSA key but when I putty/ssh in, I get this warning: The first key-exchange algorithm supported by the server is diffie-hellman-group1-sha1, which is below the configured warning threshold.

Should I go with "crypto key gen rsa 2048" or something similar?

Thanks.

Re: What is the minimum recommended crypto key setting?

BenBeck — Wed, 02 Nov 2022 13:40:20 GMT

The warning level is generally a client-side configuration option.

In regards to better key gen options:

*what you mentioned

SSH@ICX(config)#crypto key gen rsa modulus 2048

and/or

SSH@ICX(config)#crypto key generate ec size 384

There is more information about encryption methods in 'show ip ssh config'. Supported methods change a bit from code to code. Our security guide is a good place to look. Here is the 8095 version, but you can find the same document for whatever code you are running:

https://docs.commscope.com/bundle/fastiron-08095-securityguide/page/GUID-8F5FD2C5-0AC4-4EBA-BEE8-E4ECF3D38550.html

From mentioned page > Home > RUCKUS ICX Switches > Pick code train on left side > Security guide for SSH items

Hope that helps!

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What is the minimum recommended crypto key setting?

Re: What is the minimum recommended crypto key setting?