RSA is an algorithm for public key cryptography. It's the first algorithm known to be suitable for signing, as well as encryption.
The RSA Keys screen displays a list of RSA keys installed in the selected access point. RSA Keys are generally used for establishing a SSH session, and are a part of the certificate set used by RADIUS, VPN and HTTPS.
To view the access point's RSA Key details:
The RSA Key Details field describes the size (in bits) of the desired key. If not specified, a default key size of 1024 is used.
The RSA Public Key field describes the public key used for encrypting messages. This key is known to everyone.