Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth

Newsgroups	comp.lang.forth
Date	2012-12-13 20:53 -0800
References	(3 earlier) <7x1ueuano2.fsf@ruckus.brouhaha.com> <8889040f-a006-4dbd-8956-a231b492c068@googlegroups.com> <7xy5h2fist.fsf@ruckus.brouhaha.com> <626ebdde-0470-48f7-bd2e-d121942b2e67@googlegroups.com> <7x38z9i7kq.fsf@ruckus.brouhaha.com>
Message-ID	<c8e978c7-1016-4e10-9e7b-a848ed3d77ae@googlegroups.com> (permalink)
Subject	Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth
From	Howerd <howerdo@yahoo.co.uk>

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On Friday, December 14, 2012 5:25:09 AM UTC+1, Paul Rubin wrote:
> Howerd <howxxxx@yahoo.co.uk> writes:
> 
> > IIRC the number of rounds for the original TEA was 32,
> 
> 
> 
> IIRC it was always 64.  There is a loop that repeats 32 times, but each
> 
> iteration through the loop does two encryption rounds.
> 
> 
> 
> > For me, it is more important to have an algorithm that is so simple
> 
> > that there are obviously no backdoors,
> 
> 
> 
> There can be more difficult-to-find security problems, of course.
> 
> 
> 
> > Also to be avoided is anything involving s-boxes, as these may allow
> 
> > relatively simple parallel calculations to crack the algorithm.
> 
>  
> 
> I can't make any sense of that.  S-boxes don't help with parallelism--
> 
> if anything they interfere with it.  But, they introduce other problems
> 
> such as cache-timing attacks in software implementations.
> 
> 
> 
> > Also with TEA it is very easy to expand to wider bit
> 
> > lengths.... Logically the longer words must inherit the same security
> 
> > features as the shorter ones, but with more strength.
> 
> 
> 
> No that doesn't logically follow at all.  Block cipher design is an
> 
> extremely complicated subject and simple arguments and intuitions often
> 
> turn out to be unsound or wrong.
> 
> 
> 
> This study guide to block-cipher cryptanalysis is old but good:
> 
> 
> 
> http://www.schneier.com/paper-self-study.html

Hi Paul,

> IIRC it was always 64.  There is a loop that repeats 32 times, but each
> iteration through the loop does two encryption rounds.
Yes, you are right.

I just found this on the internet :
http://derekwilliams.us/docs/CPSC-6128-TEA-Encryption.pdf

A quote :
"In practice, misinformation about encryption algorithms can be more dangerous than academic weaknesses in the design."

It is interesting that TEA is not intended to be used as a Hash, according to this article.
I would like to know why TEA does not make a good Hash - presumably it is the related keys...

Best regards,
Howerd

Thread

ANN: SHA-256 Secure Hash Algorithm in ANS Forth Howerd <howerdo@yahoo.co.uk> - 2012-11-20 22:32 -0800
  Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth stephenXXX@mpeforth.com (Stephen Pelc) - 2012-11-22 22:53 +0000
    Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth ritaoakford@gmail.com - 2012-11-23 00:21 -0800
    Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth albert@spenarnc.xs4all.nl (Albert van der Horst) - 2012-11-23 14:20 +0000
    Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth mhx@iae.nl (Marcel Hendrix) - 2012-11-25 22:58 +0200
      Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Paul Rubin <no.email@nospam.invalid> - 2012-11-25 14:41 -0800
        Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth mhx@iae.nl (Marcel Hendrix) - 2012-11-26 00:59 +0200
          Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Paul Rubin <no.email@nospam.invalid> - 2012-11-25 16:10 -0800
          Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Howerd <howerdo@yahoo.co.uk> - 2012-11-26 04:18 -0800
          Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Bernd Paysan <bernd.paysan@gmx.de> - 2012-11-26 19:17 +0100
      Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth stephenXXX@mpeforth.com (Stephen Pelc) - 2012-11-26 11:57 +0000
        Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-11-26 06:17 -0600
        Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth mhx@iae.nl (Marcel Hendrix) - 2012-11-26 23:22 +0200
          Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth stephenXXX@mpeforth.com (Stephen Pelc) - 2012-11-27 13:33 +0000
        Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Fritz Wuehler <fritz@spamexpire-201211.rodent.frell.theremailer.net> - 2012-11-27 09:18 +0100
          Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Mark Wills <forthfreak@gmail.com> - 2012-11-27 01:08 -0800
          Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth stephenXXX@mpeforth.com (Stephen Pelc) - 2012-11-27 11:18 +0000
          Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth albert@spenarnc.xs4all.nl (Albert van der Horst) - 2012-11-27 16:32 +0000
            Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Fritz Wuehler <fritz@spamexpire-201211.rodent.frell.theremailer.net> - 2012-11-28 11:59 +0100
              Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth albert@spenarnc.xs4all.nl (Albert van der Horst) - 2012-11-28 14:11 +0000
  Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth albert@spenarnc.xs4all.nl (Albert van der Horst) - 2012-11-26 16:50 +0000
  Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth stephenXXX@mpeforth.com (Stephen Pelc) - 2012-11-27 13:36 +0000
    Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Howerd <howerdo@yahoo.co.uk> - 2012-11-28 14:31 -0800
      Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Howerd <howerdo@yahoo.co.uk> - 2012-11-28 14:36 -0800
      Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Josh Grams <josh@qualdan.com> - 2012-11-30 00:08 +0000
        Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Howerd <howerdo@yahoo.co.uk> - 2012-11-30 13:56 -0800
          Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Josh Grams <josh@qualdan.com> - 2012-12-01 16:02 +0000
            Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Howerd <howerdo@yahoo.co.uk> - 2012-12-01 13:54 -0800
              Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Josh Grams <josh@qualdan.com> - 2012-12-02 11:26 +0000
      Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Paul Rubin <no.email@nospam.invalid> - 2012-12-12 14:52 -0800
        Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Howerd <howerdo@yahoo.co.uk> - 2012-12-12 23:47 -0800
          Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Paul Rubin <no.email@nospam.invalid> - 2012-12-13 00:38 -0800
            Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Howerd <howerdo@yahoo.co.uk> - 2012-12-13 20:17 -0800
              Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Paul Rubin <no.email@nospam.invalid> - 2012-12-13 20:25 -0800
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Howerd <howerdo@yahoo.co.uk> - 2012-12-13 20:53 -0800
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Paul Rubin <no.email@nospam.invalid> - 2012-12-13 21:16 -0800
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Howerd <howerdo@yahoo.co.uk> - 2012-12-14 03:43 -0800
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-12-14 12:15 -0600
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Paul Rubin <no.email@nospam.invalid> - 2012-12-20 00:21 -0800
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-12-14 04:45 -0600
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Howerd <howerdo@yahoo.co.uk> - 2012-12-14 03:33 -0800
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-12-14 12:20 -0600
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Paul Rubin <no.email@nospam.invalid> - 2012-12-14 10:28 -0800
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-12-14 12:39 -0600
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Bernd Paysan <bernd.paysan@gmx.de> - 2012-12-15 01:47 +0100
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Paul Rubin <no.email@nospam.invalid> - 2012-12-19 18:10 -0800
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Paul Rubin <no.email@nospam.invalid> - 2012-12-19 19:53 -0800
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Bernd Paysan <bernd.paysan@gmx.de> - 2012-12-20 14:44 +0100
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Bernd Paysan <bernd.paysan@gmx.de> - 2012-12-20 19:28 +0100
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Paul Rubin <no.email@nospam.invalid> - 2012-12-20 13:56 -0800
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Bernd Paysan <bernd.paysan@gmx.de> - 2012-12-21 01:41 +0100
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-12-21 03:58 -0600
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Paul Rubin <no.email@nospam.invalid> - 2012-12-21 02:20 -0800
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-12-21 06:46 -0600
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Bernd Paysan <bernd.paysan@gmx.de> - 2012-12-21 15:34 +0100
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-12-21 08:40 -0600
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Bernd Paysan <bernd.paysan@gmx.de> - 2012-12-22 03:36 +0100
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Paul Rubin <no.email@nospam.invalid> - 2012-12-21 20:07 -0800
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Bernd Paysan <bernd.paysan@gmx.de> - 2012-12-23 02:37 +0100
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Paul Rubin <no.email@nospam.invalid> - 2012-12-22 19:24 -0800
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Bernd Paysan <bernd.paysan@gmx.de> - 2012-12-23 15:52 +0100
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Paul Rubin <no.email@nospam.invalid> - 2012-12-23 17:52 -0800
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-12-24 03:57 -0600
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Bernd Paysan <bernd.paysan@gmx.de> - 2012-12-24 16:20 +0100
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Paul Rubin <no.email@nospam.invalid> - 2012-12-24 15:36 -0800
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Bernd Paysan <bernd.paysan@gmx.de> - 2012-12-25 02:52 +0100
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Paul Rubin <no.email@nospam.invalid> - 2012-12-24 21:51 -0800
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Bernd Paysan <bernd.paysan@gmx.de> - 2012-12-25 20:56 +0100
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Paul Rubin <no.email@nospam.invalid> - 2012-12-26 01:08 -0800
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Bernd Paysan <bernd.paysan@gmx.de> - 2012-12-26 16:02 +0100
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth David Thompson <dave.thompson2@verizon.net> - 2012-12-31 02:48 -0500
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth kenney@cix.compulink.co.uk - 2012-12-24 03:20 -0600
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-12-22 03:24 -0600
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Bernd Paysan <bernd.paysan@gmx.de> - 2012-12-23 01:24 +0100
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-12-23 04:59 -0600
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Bernd Paysan <bernd.paysan@gmx.de> - 2012-12-23 17:32 +0100
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Andrew Haley <andrew29@littlepinkcloud.invalid> - 2012-12-23 11:28 -0600
                Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth Bernd Paysan <bernd.paysan@gmx.de> - 2012-12-24 00:30 +0100
  Re: ANN: SHA-256 Secure Hash Algorithm in ANS Forth jzakiya@gmail.com - 2012-12-07 14:27 -0800

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