The following documents describe the features of the cPanel Security box.

Recommended reading: Full cPanel guide for webmasters

• Password Protect Directories — This feature allows you to restrict access to certain parts of your website.
  

• IP Deny Manager —This feature is capable of blocking a single IP address or a range of IP addresses.

• SSL/TLS Manager — This feature allows you to manage SSL/TLS keys, certificates, and signing requests. These features are intended to make your website more secure.

• SSH/Shell Access — These features allow you to connect to your server remotely.

• HotLink Protection — These features allow you to prevent other websites from stealing bandwidth.

• Leech Protect — These features allow you to prevent users from sharing passwords publicly.

• Add a GnuPG Key — These features allow create and manage GnuPG keys, that use the “public key approach” to encryption.

Source: http://docs.cpanel.net/