NAME

       tcl::transform::rot - rot-encryption

SYNOPSIS

       package require Tcl  8.6

       package require tcl::transform::core  ?1?

       package require tcl::transform::rot  ?1?

       ::tcl::transform::rot chan key

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DESCRIPTION

       The  tcl::transform::rot  package  provides  a  command  creating a channel transformation which performs
       primitive encryption (on writing) and decryption (on reading) on the alphabetic characters. The algorithm
       is the Caesar-cipher, a specific variant of which is rot13.

       A related transformations in this module is tcl::transform::otp.

       The internal TclOO class implementing the transform handler is a sub-class  of  the  tcl::transform::core
       framework.

API

       ::tcl::transform::rot chan key
              This  command  creates  a rot encryption transformation on top of the channel chan and returns its
              handle.

              The "key" specifies how far characters are rotated in the alphabet, and is wrapped  to  the  range
              "0...25".

              Note  that  this transformation affects only bytes in the ranges ASCII 65...90, and 97...122, i.e.
              the upper- and lower-case alphabetic characters, i.e. "A...Z" and "a...z".  All  other  bytes  are
              passed through unchanged.

BUGS, IDEAS, FEEDBACK

       This  document,  and  the package it describes, will undoubtedly contain bugs and other problems.  Please
       report     such     in     the     category     virtchannel     of     the     Tcllib     SF     Trackers
       [http://sourceforge.net/tracker/?group_id=12883].   Please also report any ideas for enhancements you may
       have for either package and/or documentation.

KEYWORDS

       caesar cipher, channel transformation, cipher, decryption, encryption, reflected channel, rot, rot13, tip
       230, transformation, virtual channel

CATEGORY

       Channels

COPYRIGHT

       Copyright (c) 2009 Andreas Kupries <andreas_kupries@users.sourceforge.net>

virtchannel_transform                                   1                              tcl::transform::rot(3tcl)