# General

> Markdown source of <https://docs.calebsargeant.com/networking/cisco/general/>.

## Public Key Authentication

<https://en.wikiversity.org/wiki/Cisco_IOS/Configure_public_RSA_key_authentication>

``` bash
# Generate RSA key on your client machine, laptop, or whatever
ssh-keygen

# Fold the key to format it for Cisco to understand
fold -b -w 72 ~/.ssh/id_rsa.pub
```

``` text
ROUTER# conf t
ROUTER(config)#ip ssh pubkey-chain
ROUTER(conf-ssh-pubkey)#username USERNAME
ROUTER(conf-ssh-pubkey-user)#key-string
ROUTER(conf-ssh-pubkey-data)#THE_FOLD_OUTPUT
ROUTER(conf-ssh-pubkey-data)#exit
ROUTER(conf-ssh-pubkey-user)#exi
ROUTER(conf-ssh-pubkey)#exi
ROUTER(config)#do wr
```

## Next Generation Encryption

<https://tools.cisco.com/security/center/resources/next_generation_cryptography>