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Accomplishing Text Compression by Hidden Messages

IP.com Disclosure Number: IPCOM000111866D
Original Publication Date: 1994-Apr-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 2 page(s) / 55K

Publishing Venue

IBM

Related People

Parikh, SN: AUTHOR

Abstract

Data compression is a very commonly used technology. Commonly used compression techniques rely on repeated, consecutive occurrence of same character (byte). However, this scheme is not too successful in case of text documents (e.g., a set of PROFS notes) since there is very little repetition of same character, with the result that often compression techniques are not applied.

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This is the abbreviated version, containing approximately 53% of the total text.

Accomplishing Text Compression by Hidden Messages

      Data compression is a very commonly used technology.  Commonly
used compression techniques rely on repeated, consecutive occurrence
of same character (byte).  However, this scheme is not too successful
in case of text documents (e.g., a set of PROFS notes) since there is
very little repetition of same character, with the result that often
compression techniques are not applied.

      This invention describes a method whereby it is possible to
achieve an incremental reduction in the total size required by a
group of distinct text objects.

      This invention builds on the fact that in a typical textual
document, only a subset of ASCII character set is used to represent
information while a large number of characters are not used.  (e.g.,
in a pure text message character codes for a-z and A-Z and 0-9 will
be used.  In strictly upper case documents a-z will not be used.  The
space character will be represented by the '00100000' bit string.)

      In a typical text document, there will be several space
characters (e.g., between two words and between two paragraphs and
even between two lines).  There will be some extra space characters
used for spacing and aesthetic reasons in general.

      This method, in a very novel way, uses the space characters
present in all text documents.  It uses these characters to 'hide'
another text document in the space characters.  This is achieved by
the following method:

    As me...