Stunnel

Stunnel: Open-Source Secure Encrypted Connection Software

Stunnel is an open-source software that provides secure encrypted connections by wrapping existing TCP-based network protocols, adding TLS encryption to non-TLS aware applications.

What is Stunnel?

stunnel is an open source software used to provide secure encrypted connections for clients and servers that do not support encryption themselves. It works by wrapping existing TCP-based protocols to add TLS (Transport Layer Security) or SSL (Secure Sockets Layer) encryption.

Some key features of stunnel include:

• Ability to encrypt non-TLS aware network protocols and tunnel them through an encrypted SSL connection
• Can be used with many TCP-based applications like POP3, IMAP, LDAP, etc to add encryption
• Available for many platforms like Windows, Linux, BSD, etc
• Lightweight and easy to configure
• Can be used in client mode or server mode
• Supports certificate authentication
• Logs activity for troubleshooting

stunnel is useful for system administrators or developers that need to add TLS encryption to legacy applications or protocols that do not have encryption built-in. For example, using stunnel with a POP3 mail server allows the data to be transmitted securely through an encrypted tunnel between the client and server. stunnel can help improve the security of non-TLS aware network applications without having to completely replace or redesign them.

Stunnel Features

Official Links