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Implement a SFTP Service for Ubuntu/Debian With a Chroot’ed, Isolated File Directory.

20/06/2013

The Developer's Tidbits

In this entry I will explain how to install and setup a SFTP service in a Ubuntu or Debian Linux server. SFTP (Secure File Transfer Protocol) is an extension of the SSH (Secure SHell protocol) which is commonly used for secure remote access into systems.

Despite its name SFTP is not an extension to the 1985 FTP (File Transfer Protocol – RFC 959) which was in common use until the late 1990s to share files online. FTP usage has fallen out of favor for Internet use in the 2000’s due to the protocol’s inherent insecurities in addition to competition from newer protocol such as the bandwidth friendly BitTorrent protocol. The most glaring insecurity with FTP is that it requires log-in user names and passwords to be communicated between the client and the server using unencrypted plain-text.

Fortunately in recent years many of the more popular FTP clients have implemented complete support for…

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