phc-discussions - Re: [PHC] RE: What Microsoft Would like from the PHC

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Date: Tue, 19 Aug 2014 16:24:07 +0400
From: Solar Designer <solar@...nwall.com>
To: discussions@...sword-hashing.net
Cc: admin@...ne.org
Subject: Re: [PHC] RE: What Microsoft Would like from the PHC - Passwords14 presentation

On Fri, Aug 15, 2014 at 06:50:46PM +0000, Marsh Ray wrote:
> Does anyone know why the file I get when I download that .pdf attachment in the Gmane archive is 500k larger than the file I attached to the original email?

This is regarding http://permalink.gmane.org/gmane.comp.security.phc/1793

Looks like a Gmane bug.  It's probably reporting the size including
base64 overhead, instead of the original size.

Your original:

$ sha1sum Microsoft-PHC-Passwords14.pdf 
6fdbe09d75edff05f03e2408a3ae36467aa8594d  Microsoft-PHC-Passwords14.pdf

Downloaded from Gmane:

$ head -c 1341846 1793-001.bin | sha1sum 
6fdbe09d75edff05f03e2408a3ae36467aa8594d  -
$ tail -c +1341847 1793-001.bin | od 
0000000 000000 000000 000000 000000 000000 000000 000000 000000
*
1627440 000000 000000 000000 000000
1627450

So it's just trailing zeroes.  Should be benign.

The size difference is:

1812670/1341846 = ~1.35

> Original:
> 
> 
> $ sha256sum /cygdrive/c/Users/maray/Documents/passwords/Microsoft-PHC-Passwords14.pdf
> 441e2395917c2eca05a0a4a14c2180f90b4adda13d12b5af5633299ff7db99e7 */cygdrive/c/Users/maray/Documents/passwords/Microsoft-PHC-Passwords14.pdf
> 
> 
> $ ls -l /cygdrive/c/Users/maray/Documents/passwords/Microsoft-PHC-Passwords14.pdf
> -rwx------+ 1 maray Domain Users 1341846 Aug 15 11:06 /cygdrive/c/Users/maray/Documents/passwords/Microsoft-PHC-Passwords14.pdf
> 
> 
> 
> 
> Received via email seems to match:
> 
> 
> $ sha256sum /cygdrive/c/maray/downloads/from-mailbox-Microsoft-PHC-Passwords14.pdf
> 441e2395917c2eca05a0a4a14c2180f90b4adda13d12b5af5633299ff7db99e7 */cygdrive/c/maray/downloads/from-mailbox-Microsoft-PHC-Passwords14.pdf
> 
> 
> 
> 
> >From http://permalink.gmane.org/gmane.comp.security.phc/1793 :
> 
> 
> 
> 
> $ sha256sum /cygdrive/c/maray/downloads/1793-001.bin
> c823612f874d9069ede5d2e4568836b00025875b5dcdc6b1969357d803d06d96 */cygdrive/c/maray/downloads/1793-001.bin
> 
> 
> $ ls -l /cygdrive/c/maray/downloads/1793-001.bin
> ----------+ 1 maray Domain Users 1812670 Aug 15 11:27 /cygdrive/c/maray/downloads/1793-001.bin
> 
> 
> 
> 
> 
> 
> -          Marsh
> 
> 
> 
> 
> From: Marsh Ray [mailto:maray@...rosoft.com]
> Sent: Friday, August 15, 2014 11:17 AM
> To: discussions@...sword-hashing.net
> Subject: [PHC] What Microsoft Would like from the PHC - Passwords14 presentation
> 
> 
> Passwords14 presentation: What Microsoft Would like from the PHC
> 
> 
> Slides attached.
> 
> 
> Video: https://www.youtube.com/watch?v=Kr6ruthF_4k
> 
> 
> Thanks again to Per, Jeremey, and everyone for making it such a great conference!
> 
> 
> 
> 
> -          Marsh

Alexander