Stunnel is a program that allows you to encrypt arbitrary TCP connections inside SSL (Secure Sockets Layer) available on both Unix and Windows. Stunnel can allow you to secure non-SSL aware daemons and protocols (like POP, IMAP, NNTP, LDAP, etc) by having Stunnel provide the encryption, requiring no changes to the daemon's code.
58dbe96cc345f0da76e6db10ebb3c98646a3db01584b7d4fa8b27ed549838580