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
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.
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>