This application is designed to allow TLS encryption functionality to already-running clients and servers without modifying the programs’ code. Mainly, the utility is developed for security, portability, and scalability so it can be used even for large deployments. It provides SSL (secure socket layer) encryption to inetd daemons like POP2/3 and IMAP servers. Plus, the utility can work with standalone daemons such as SMTP, NNTP, HTTP, and tunneling PPP on network sockets. It utilizes OpenSSL library for cryptography; thus, it also runs cryptographic algorithms which are compiled into its library. You cannot use this app if you’re not advanced in client-server encryption or networking.
To get this app working on a PC, you need to install it natively as you would do for other programs working on your PC. However, during the installation process, quite a lot of information will be requested from you and you may not understand this required info if you’re not advanced. Configuring this app to function effectively for your cause is also dependent on your knowledge on server/clients encryption. Nevertheless, for some of the settings, you’ll be provided with tooltips. Plus, the set up based on a demo file. This can be a very useful utility for advanced network administrations, while it may be impossible for a random PC user to understand how it works.
Stunnel is licensed as freeware for PC or laptop with Windows 32 bit and 64 bit operating system. It is in other networking tools category and is available to all software users as a free download.