Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail
From: Richard Heathfield <rjh@cpax.org.uk>
Newsgroups: sci.crypt
Subject: Re: lun - Lucky Number
Date: Sun, 9 Mar 2025 00:19:52 +0000
Organization: Fix this later
Lines: 42
Message-ID: <vqimr9$cjjn$1@dont-email.me>
References: <vqg3sj$3q7rg$1@stefan.eternal-september.org>
 <vqi2io$8r9n$1@dont-email.me> <vqi2qe$90e8$1@stefan.eternal-september.org>
 <vqi419$8rlr$2@dont-email.me> <vqi4oe$95dd$3@stefan.eternal-september.org>
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 7bit
Injection-Date: Sun, 09 Mar 2025 01:20:08 +0100 (CET)
Injection-Info: dont-email.me; posting-host="66293360dcff8ed84aa89f1d5417d935";
	logging-data="413303"; mail-complaints-to="abuse@eternal-september.org";	posting-account="U2FsdGVkX1+3zFl5GqEKyqjHhNgY3DDMT5L6oAxi5dFKFAfkMrJGEw=="
User-Agent: Mozilla Thunderbird
Cancel-Lock: sha1:JFYxzG3WXW7GVMC0AsLb+fyEues=
Content-Language: en-GB
In-Reply-To: <vqi4oe$95dd$3@stefan.eternal-september.org>
Bytes: 2151

On 08/03/2025 19:11, Stefan Claas wrote:
> Well, Rich (and maybe you) should also show things to the community here,
> which can be discussed, otherwise this place is getting pretty boring.

Okay. How about a new primitive? (I /think/ it's new, but of 
course there's nothing new under the sun so I might be mistaken.)

Take 8 consecutive bytes, imagine them as a square of 8x8 bits, 
and 'tumbleweed' the bits clockwise.

That is, turn this:

      abcdefgh
      ijklmnop
      qrstuvwx
      yzABCDEF
      GHIJKLMN
      OPQRSTUV
      WXYZ0123
      456789+=

to this:

      4WOGyqia
      5XPHzrjb
      6YQIAskc
      7ZRJBtld
      80SKCume
      91TLDvnf
      +2UMEwog
      =3VNFxph

The inverse is of course to tumbleweed them anticlockwise.

Sort of gives a new spin to bit rotation.

-- 
Richard Heathfield
Email: rjh at cpax dot org dot uk
"Usenet is a strange place" - dmr 29 July 1999
Sig line 4 vacant - apply within