Stunnel TLS, SSL Encryption Software For Windows Download 5.60

Stunnel is a software program created to allow secure client-server transfers. Its purpose is to provide encryption via SSL (secure socket layer) to intend daemons such as POP2, POP3, and IMAP servers.

It can be used with standalone daemons (NNTP, SMTP, and HTTP) and tunneling PPP over network sockets, too.

Since the application is not intended for the average user solid knowledge about encrypted transfers and client-server relationships is required.

The most important part of tunnel is its configuration. Setting everything up can be done from the main application window, which also lists a brief log of the operations carried out.

Customizing the connection should not be a difficult job for a more advanced user, especially since most of the options are accompanied by tooltips and the configuration is based on a demo file.

Among the options available there is the possibility to enable FIPS 140-2 mode, a security standard for validating cryptographic modules. Furthermore, at least one service must also be defined in the configuration file. Once the program started, the terminal window informs the user of the current setup.

Stunnel TLS Encryption Software For Windows Features

Portability (Threading Models):

• PTHREAD (Posix)
• FORK (traditional Unix)
• UCONTEXT (userlevel)
• Performance and Scalability:
• Load sharing among multiple backend servers
• External session cache (for clusters)
• Compression (for limited bandwidth)

Support for OpenSSL Security Features:

• Certificate-based access control
• CRL and OCSP certificate revocation
• SNI (Server Name Indication) support for name-based virtual servers
• PFS (Perfect Forward Secrecy) with DH and ECDH key agreement
• FIPS mode (for compliance)
• Configuration of hardware engines

Features Specific to Unix Platform:

• Local mode (running services designed for inetd) with optional pseudo-terminal allocation
• chroot (additional security)
• setuid/setgid (additional security)
• Logging to syslog
• Libwrap (TCP Wrappers) access control
• Transparent proxy on selected platforms
• EGD (Entropy Gathering Daemon) client
• Unix socket support
• Features Specific to Windows Platform:
• GUI
• Saving cached peer certificate chains to files
• Windows service mode

Other Features of Stunnel SSL Encryption Software:

• IPv6 support
• Protocol negotiation for cifs, connect, imap, nntp, pgsql, pop3, proxy, and SMTP
• Delayed resolver (for dialup connections and remote hosts with dynamic IP addresses)
• Graceful configuration file reloading
• Graceful log file reopening
• Ident access control