Not-entirely-secure method of sending documents

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Last seen on: Jonesin’ – Jul 14 2020

Random information on the term “FAX”:

Modified Huffman coding is used in fax machines to encode black on white images (bitmaps). It combines the variable length codes of Huffman coding with the coding of repetitive data in run-length encoding.

The basic Huffman coding provides a way to compress files that have much repeating data, like a file containing text where the alphabet letters are the repeating objects. However a single scan line contains only two kinds of elements white pixels and black pixels which can be represented directly as a 0 and 1. These two symbols are too small a list of items to directly apply the Huffman coding. But if we first use run-length encoding we can have more objects to encode. Here is an example taken from the article on run-length encoding:

A hypothetical scan line, with B representing a black pixel and W representing white, might read as follows:

With a run-length encoding (RLE) data compression algorithm applied to the above hypothetical scan line, it can be rendered as follows:

FAX on Wikipedia