All data transmitted over a network is open to monitoring. Encrypt transmitted data whenever possible with
password or using keys / certificates.

Use scp, ssh, rsync, or sftp for file transfer. You can also mount remote server file system or your own
home directory using special sshfs and fuse tools.
GnuPG allows to encrypt and sign your data and communication, features a versatile key managment system as
well as access modules for all kind of public key directories.
Fugu is a graphical frontend to the commandline Secure File Transfer application (SFTP). SFTP is similar to
FTP, but unlike FTP, the entire session is encrypted, meaning no passwords are sent in cleartext form, and is
thus much less vulnerable to third-party interception. Another option is FileZilla - a cross-platform client
that supports FTP, FTP over SSL/TLS (FTPS), and SSH File Transfer Protocol (SFTP).
OpenVPN is a cost-effective, lightweight SSL VPN.
Lighttpd SSL (Secure Server Layer) Https Configuration And Installation
Apache SSL (Secure Server Layer) Https (mod_ssl) Configuration And Installation

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