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Pradeep H A
Beginner

RSA Crypto Key pairs

Hi,

I found this on our router:

Router#show crypto key mypubkey rsa

% Key pair was generated at: 13:52:01 GMT Oct 9 2010

Key name: Router

Storage Device: private-config

Usage: General Purpose Key

Key is not exportable.

Key Data:

<blah blah>

% Key pair was generated at: 17:50:29 GMT Nov 1 2012

Key name: Router.server

Temporary key

Usage: Encryption Key

Key is not exportable.

Key Data:

<blah blah>

% Key pair was generated at: 17:54:08 GMT Nov 1 2012

Key name: Router

Storage Device: not specified

Usage: General Purpose Key

Key is not exportable.

Key Data:

<blah blah>

My question:

1. I found no statement in configuration that explicitly configures the router for using RSA. any specific reason why Cisco router uses RSA keys & not DH keys by default? can I configure it to use DH keys?

2. When I enter crypto key generate rsa command it generates 2 pairs of keys! Why 2 pairs? isnt 1 pair enough?

3. If I enter crypto key generate rsa command again 1 more pair will be generated. Which one the router will use for SSH?

1 REPLY 1
Pradeep H A
Beginner

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