Security Certificates

Private key file
This file is your personal and private certificate file. Do not share this with other users or hubs. If you do, you risk allowing others to use your certificate and in essence pose as you.
Own certificate file
This file is the certificate file you should give to other users and hubs that you want to consider "trusted".
Trusted certificates path
Where trusted certificates from users or hubs will be stored. (default: the Certs\ subdirectory of where you've installed the application.)

Options

Use SSL when remote client supports it
When this option is enabled, DC++ will connect to remote clients on an ADC hub that support SSL using SSL.  This option is an experimental one, and shouldn't imply that DC++ is secure in any way.
Allow TLS connections to hubs without trusted certificate
With this option disabled, all hubs you connect to must have a certificate in your Trusted certificate folder.
Allow TLS connections to clients without trusted certificate
With this option disabled, all client you connect to must have a certificate in your Trusted certificate folder.
To see effects, please restart DC++.

SSL support is an experimental feature and doesn't imply that DC++ is secure in any way.