* bug#47970: Move lisp/rot13.el to lisp/play/rot13.el
2021-04-24 6:22 ` Eli Zaretskii
@ 2021-04-24 8:59 ` Stefan Kangas
0 siblings, 0 replies; 4+ messages in thread
From: Stefan Kangas @ 2021-04-24 8:59 UTC (permalink / raw)
To: Eli Zaretskii, rms; +Cc: 47970
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tags 47970 fixed
close 47970 28.1
thanks
Eli Zaretskii <eliz@gnu.org> writes:
>> From: Richard Stallman <rms@gnu.org>
>> Date: Sat, 24 Apr 2021 00:43:55 -0400
>> Cc: 47970@debbugs.gnu.org
>>
>> rot13 has real use. People encrypt text that way if it contains spoilers.
>> Then other users can't read it unless they are sure they want to.
>
> Maybe this hint should be added to the file's Commentary section.
Thanks, I've installed the attached. Closing.
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From ae81b9503ac4af7d4e57ee81f3b953142d6fb015 Mon Sep 17 00:00:00 2001
From: Stefan Kangas <stefan@marxist.se>
Date: Sat, 24 Apr 2021 10:47:50 +0200
Subject: [PATCH] * lisp/rot13.el: Improve documentation. (Bug#47970)
---
lisp/rot13.el | 29 +++++++++++++++++++----------
1 file changed, 19 insertions(+), 10 deletions(-)
diff --git a/lisp/rot13.el b/lisp/rot13.el
index dfcf4adc17..4e4e60fea3 100644
--- a/lisp/rot13.el
+++ b/lisp/rot13.el
@@ -3,6 +3,7 @@
;; Copyright (C) 1988, 2001-2021 Free Software Foundation, Inc.
;; Author: Howard Gayle
+;; Simon Josefsson
;; Maintainer: emacs-devel@gnu.org
;; This file is part of GNU Emacs.
@@ -22,18 +23,26 @@
;;; Commentary:
-;; The entry point, `rot13-other-window', performs a Caesar cipher
-;; encrypt/decrypt on the current buffer and displays the result in another
-;; window. ROT13 encryption is sometimes used on USENET as a read-at-your-
-;; own-risk wrapper for material some might consider offensive, such as
-;; ethnic humor.
+;; "ROT13 ('rotate by 13 places') is a simple letter substitution
+;; cipher that replaces a letter with the 13th letter after it in
+;; the alphabet. ROT13 is a special case of the Caesar cipher
+;; which was developed in ancient Rome.
;;
-;; Written by Howard Gayle.
-;; This hack is mainly to show off the char table stuff.
+;; Because there are 26 letters (2×13) in the basic Latin
+;; alphabet, ROT13 is its own inverse; that is, to undo ROT13, the
+;; same algorithm is applied, so the same action can be used for
+;; encoding and decoding. The algorithm provides virtually no
+;; cryptographic security, and is often cited as a canonical
+;; example of weak encryption.
;;
-;; New entry points, `rot13', `rot13-string', and `rot13-region' that
-;; performs Caesar cipher encrypt/decrypt on buffers and strings, was
-;; added by Simon Josefsson.
+;; ROT13 is used in online forums as a means of hiding spoilers,
+;; punchlines, puzzle solutions, and offensive materials from the
+;; casual glance." - Wikipedia article on ROT13
+;;
+;; The entry points, `rot13', `rot13-string', and `rot13-region' performs ROT13
+;; encoding/decoding on buffers and strings. The entry point
+;; `rot13-other-window' performs a ROT13 encoding/decoding on the current
+;; buffer and displays the result in another window.
;;; Code:
--
2.30.2
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