bionic (3) rot.3tcl.gz

Provided by: tcllib_1.19-dfsg-2_all bug

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 Trackers [http://core.tcl.tk/tcllib/reportlist].
       Please also report any ideas for enhancements you may have for either package and/or documentation.

       When proposing code changes, please provide unified diffs, i.e the output of diff -u.

       Note further that attachments are strongly preferred over inlined patches. Attachments  can  be  made  by
       going  to the Edit form of the ticket immediately after its creation, and then using the left-most button
       in the secondary navigation bar.


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


CATEGORY
       Channels


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