Crypto keys

Generally when i create an rsa key for ssh i do
"crypto key generate rsa"

The sub menu has different types of keys as per below.

encryption
general-keys
signature
usage-keys

What type of key have i created as default? where would i use these other option?
The description on the cli is too vague, any examples of where to use the different types?

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SecurityThroughObscurity

General purpose keys use the same key pair for signing and encrypting.

SecurityThroughObscurity

If you generate special-usage keys, two pairs of RSA keys will be generated.

Master Of Puppets

When you issue the command 'crypto key generate rsa', the default is general-keys which generates one pair of keys for general purposes. The default size is 1024 and this is what you use for SSH. Usage-keys generates two pairs of keys - one for encrypting and one for signing. This can be used when you need two certificates. The encryption and signature keywords are the so called keys for special usage. I haven't really used them so I can't give you the specifics.