Re: Need some help confirming transactions using sha256

Date	2013-02-01 15:34 +0100
From	Christian Heimes <christian@python.org>
Subject	Re: Need some help confirming transactions using sha256
References	<21037ba0-57e5-4e44-8d50-6503a1187492@googlegroups.com> <amvpfoF7s8gU1@mid.individual.net>
Newsgroups	comp.lang.python
Message-ID	<mailman.1278.1359729277.2939.python-list@python.org> (permalink)

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Am 31.01.2013 18:55, schrieb Peter Pearson:
>>>> txid = 'r7A7clvs9waizF+6QEiI0tgAq1ar48JItK3kg9kaeAFXz2vsMsHmOd9r9fhkmtxTz3CQnGAPMaDeKLvgb1A2VA'
>>>> secret = '10812806653842663997bf5971637f86f26c71a4716276d7fa8f323a83588d91:1'
>>>> hashlib.sha256(txid+":"+secret).hexdigest()
> 'dfa8769be81a543002865c88a5b52fa07f3b67fc7cd9b519c3f6a6452bcd48e4'
>>>> 0x48e4
> 18660
>>>>
> 
> .. . . which is the number you wanted, right?

Kryptox, you have chosen the correct algorithm to calculate a MAC. Very
good!

But the designers of the game are using an improper algorithm.
Apparently they don't know much about cryptography, especially length
extension attacks ...

Christian

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Need some help confirming transactions using sha256 kryptox.exchange@gmail.com - 2013-01-31 08:43 -0800
  Re: Need some help confirming transactions using sha256 kryptox.exchange@gmail.com - 2013-01-31 09:30 -0800
  Re: Need some help confirming transactions using sha256 Peter Pearson <ppearson@nowhere.invalid> - 2013-01-31 17:55 +0000
    Re: Need some help confirming transactions using sha256 kryptox.exchange@gmail.com - 2013-01-31 10:44 -0800
    Re: Need some help confirming transactions using sha256 Christian Heimes <christian@python.org> - 2013-02-01 15:34 +0100

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