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Groups > comp.lang.python > #67462

Re: Password validation security issue

From Christian Heimes <christian@python.org>
Subject Re: Password validation security issue
Date 2014-03-02 20:25 +0100
References (1 earlier) <CAPTjJmqCTLqXgmHMm2QGYJB1MmYEnhMV3OGe0jPc_UOoUQ9gQA@mail.gmail.com> <let920$fmn$1@ger.gmane.org> <CAPTjJmq0MYQugUnsL52ZN0um=V3iABHmM4+vsffD=+2YV7t=MA@mail.gmail.com> <letdt5$1g3$1@ger.gmane.org> <CAPTjJmra0AjHYjk3G+2mSgsewpX0qcmcKpQtqnebHXsQfT2YqQ@mail.gmail.com>
Newsgroups comp.lang.python
Message-ID <mailman.7592.1393788339.18130.python-list@python.org> (permalink)

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On 01.03.2014 21:11, Chris Angelico wrote:
> The problem isn't SHA-256. The problem is insecure passwords, the way
> we've been taught to make them by the banks. Hence, XKCD 936.

Your argumentation is just wrong. You are saying "It's OK to use a
totally insecure way to hash passwords because passwords are insecure".
The point of KDF and KSA is to derive some token from a low entropy
source (human input) that makes an attack harder. Please do your reading
and trust secure experts on algorithms like PBKDF2, bcrypt and
scrypt. hash(salt + password) is outdated and proven to be insecure for
at least a decade, more like 15+ years.

The concept of passwords itself is insecure. But we are stuck with
passwords for authentication mechanism for the foreseeable future. 2FA
is an attempt to increase the security of passwords-based authentication
schemes.

Christian

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Thread

Password validation security issue Renato <rvernucio@gmail.com> - 2014-03-01 09:49 -0800
  Re: Password validation security issue Chris Angelico <rosuav@gmail.com> - 2014-03-02 05:11 +1100
  Re: Password validation security issue Christian Heimes <christian@python.org> - 2014-03-01 19:31 +0100
  Re: Password validation security issue Tim Chase <python.list@tim.thechases.com> - 2014-03-01 12:38 -0600
  Re: Password validation security issue Chris Angelico <rosuav@gmail.com> - 2014-03-02 05:43 +1100
  Re: Password validation security issue Chris Angelico <rosuav@gmail.com> - 2014-03-02 05:45 +1100
  Re: Password validation security issue Christian Heimes <christian@python.org> - 2014-03-01 20:54 +0100
    Re: Password validation security issue Roy Smith <roy@panix.com> - 2014-03-01 15:25 -0500
      Re: Password validation security issue Christian Heimes <christian@python.org> - 2014-03-01 23:07 +0100
      Re: Password validation security issue Chris Angelico <rosuav@gmail.com> - 2014-03-02 09:13 +1100
  Re: Password validation security issue Chris Angelico <rosuav@gmail.com> - 2014-03-02 07:11 +1100
  Re: Password validation security issue Christian Heimes <christian@python.org> - 2014-03-02 20:25 +0100
    Re: Password validation security issue Roy Smith <roy@panix.com> - 2014-03-02 15:01 -0500
      Re: Password validation security issue Chris Angelico <rosuav@gmail.com> - 2014-03-03 07:32 +1100
      Re: Password validation security issue Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-03-03 01:16 +0000
        Re: Password validation security issue Ian Kelly <ian.g.kelly@gmail.com> - 2014-03-02 18:52 -0700
          Re: Password validation security issue Steven D'Aprano <steve@pearwood.info> - 2014-03-03 04:38 +0000
            Re: Password validation security issue Chris Angelico <rosuav@gmail.com> - 2014-03-03 16:44 +1100
            Re: Password validation security issue Ian Kelly <ian.g.kelly@gmail.com> - 2014-03-02 23:50 -0700
        Re: Password validation security issue Chris Angelico <rosuav@gmail.com> - 2014-03-03 13:56 +1100
          Re: Password validation security issue Roy Smith <roy@panix.com> - 2014-03-03 08:41 -0500
            Re: Password validation security issue Chris Angelico <rosuav@gmail.com> - 2014-03-04 00:55 +1100
              Re: Password validation security issue Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-03-03 16:46 +0000
                Re: Password validation security issue Chris Angelico <rosuav@gmail.com> - 2014-03-04 05:46 +1100
            Re: Password validation security issue MRAB <python@mrabarnett.plus.com> - 2014-03-03 16:29 +0000
            Re: Password validation security issue Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-03-03 17:41 +0000
  Re: Password validation security issue Renato <rvernucio@gmail.com> - 2014-03-02 15:10 -0800
    Re: Password validation security issue Ian Kelly <ian.g.kelly@gmail.com> - 2014-03-02 18:49 -0700
    Re: Password validation security issue Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-03-03 02:30 +0000

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