Usenet

Usenet is a distributed Internet discussion system that evolved from a general purpose UUCP network of the same name. It was conceived by Duke University graduate students Tom Truscott and Jim Ellis in 1979. Users, sometimes called Usenetters, read and post email-like messages (called "articles") to a number of distributed newsgroups, categories that resemble bulletin board systems in most respects. The medium is sustained among a large number of servers, which store and forward messages to one another. Usenet is of significant cultural importance in the networked world, having given rise to, or popularized, many widely recognized concepts and terms such as "FAQ" and "spam".

Binary content

Usenet was originally created to distribute text content encoded in the 7-bit ASCII character set. With the help of programs that encode 8-bit values into ASCII, it became practical to distribute binary content. Binary posts, due to their size and dubious copyright status, were in time restricted to specific newsgroups, making it easier for administrators to allow or disallow the traffic.

Related Topics:
Bit - ASCII - Binary

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The oldest widely used encoding method is uuencode, from the Unix uucp package. In the late 1980s Usenet articles were often limited to 60,000 characters, and larger hard limits exist today. Files are therefore commonly split into sections that require reassembly by the reader.

Related Topics:
Uuencode - Unix - Uucp - 1980s

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With the header extensions and the Base64 and Quoted-Printable MIME encodings, there was a new generation of binary transport. In practice, MIME has seen increased adoption in text messages, but it is avoided for most binary attachments. Some operating systems with metadata attached to files use specialized encoding formats. For Mac OS, both Binhex and special MIME types are used.

Related Topics:
Base64 - MIME - Metadata - Binhex

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In an attempt to reduce file transfer times, an informal file encoding known as yEnc was introduced in 2001. It achieves about a 30% reduction in data transferred by assuming that most 8-bit characters can safely be transferred across the network without first encoding into the 7-bit ASCII space.

Related Topics:
YEnc - 2001

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