1992-10-23 - BBS E-mail policy Now see if this number is in one of the following ranges:
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From: tribble@xanadu.com (E. Dean Tribble)
To: uunet!soda.berkeley.edu!hughes@uunet.UU.NET
Message Hash: 298d86c630be7b06958a77a0e2a93e61224cded16c21ee64acb6bc0f39e9ecfd
Message ID: <9210231641.AA11868@xanadu.xanadu.com>
Reply To: <9210230601.AA26160@soda.berkeley.edu>
UTC Datetime: 1992-10-23 21:42:19 UTC
Raw Date: Fri, 23 Oct 92 14:42:19 PDT
Raw message
From: tribble@xanadu.com (E. Dean Tribble)
Date: Fri, 23 Oct 92 14:42:19 PDT
To: uunet!soda.berkeley.edu!hughes@uunet.UU.NET
Subject: BBS E-mail policy Now see if this number is in one of the following ranges:
In-Reply-To: <9210230601.AA26160@soda.berkeley.edu>
Message-ID: <9210231641.AA11868@xanadu.xanadu.com>
MIME-Version: 1.0
Content-Type: text/plain
[1.5 .. 2.5] encrypted text
[3 .. 6] regular text
[7 .. 8] line noise
This is a very simple measure. There are other measures to look for
the deviation from an expected distribution, which give much more
accurate distinctions. One can very easily separate languages from
each other just by looking at such measures.
Where does uuencoded [compressed] binary lie? I would suspect it lies
right around where encrypted text is. Presumably straight encrypted
text is statistically random [7..8], but that when you8 encrypt to
just the ascii subset is when you lose the entropy.
dean
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- 1992-10-22 (Thu, 22 Oct 92 09:25:56 PDT) - BBS E-mail policy - omega@spica.bu.edu (The Omega)
- 1992-10-23 (Thu, 22 Oct 92 23:02:09 PDT) - BBS E-mail policy - Eric Hughes <hughes@soda.berkeley.edu>
- 1992-10-23 (Fri, 23 Oct 92 14:42:19 PDT) - BBS E-mail policy Now see if this number is in one of the following ranges: - tribble@xanadu.com (E. Dean Tribble)
- 1992-10-24 (Fri, 23 Oct 92 23:20:44 PDT) - entropy measures - Eric Hughes <hughes@soda.berkeley.edu>
- 1992-10-26 (Sun, 25 Oct 92 21:41:19 PPE) - Re: entropy measures - Eric Hollander <hh@soda.berkeley.edu>
- 1992-10-24 (Fri, 23 Oct 92 23:20:44 PDT) - entropy measures - Eric Hughes <hughes@soda.berkeley.edu>
- 1992-10-26 (Sun, 25 Oct 92 21:29:49 PPE) - Re: BBS E-mail policy - Eric Hollander <hh@soda.berkeley.edu>
- 1992-10-26 (Mon, 26 Oct 92 08:55:04 PPE) - entropy - Eric Hughes <hughes@soda.berkeley.edu>
- 1992-10-23 (Fri, 23 Oct 92 14:42:19 PDT) - BBS E-mail policy Now see if this number is in one of the following ranges: - tribble@xanadu.com (E. Dean Tribble)
- 1992-10-23 (Thu, 22 Oct 92 23:02:09 PDT) - BBS E-mail policy - Eric Hughes <hughes@soda.berkeley.edu>