Encryption Tools/ Services

What is Stunnel?
This tool is designed to work as an SSL encryption wrapper between remote servers and remote clients. Stunnel can benefit from FIPS 140-2 validation of the OpenSSL FIPS Object Module, as long as the building process meets its Security Policy. A scanned FIPS 140-2 Validation Certificate document is available for download on the NIST web page. The Windows binary installer is compiled with FIPS 140-2 support. The FIPS mode of operation is no longer enabled by default since stunnel 5.00.

Is Stunnel Free?
All official versions are free of charge.

Does Stunnel Work on all Operating Systems?
It works on Linux, Windows and MAC OS X.

What are the Typical Uses for Stunnel?
Stunnel can be used to add SSL functionality to commonly used functions such as POP2, POP3, and IMAP servers. The bonus is that if you use stunnel with one of the last mentioned protocols, you will not have to make any changes in tools code. Stunnel uses the OpenSSL library for cryptography.