RSA Cert KeyProvider Plugin
RSACertKeyProviderPlugin is a KeyProvider Plugin for KeePass.
It allows KeePass to use RSA certificates from the Windows certificate store as master key source. After the selection of a RSA Certificate, it passes a part from the private key (for cryptographers: the d value) to KeePass.
KeePass will use this along with the other given credentials (like password, keyfile) for encrypting your passwords.
For more information about KeePass Security, please have a look at the KeePass Security Page.