Re: Dict when defining not returning multi value key error

From	Marko Rauhamaa <marko@pacujo.net>
Newsgroups	comp.lang.python
Subject	Re: Dict when defining not returning multi value key error
Date	2014-08-02 09:41 +0300
Organization	A noiseless patient Spider
Message-ID	<87zjfnmlzr.fsf@elektro.pacujo.net> (permalink)
References	(5 earlier) <53db96bc$0$29986$c3e8da3$5496439d@news.astraweb.com> <mailman.12512.1406901485.18130.python-list@python.org> <87vbqcnrrh.fsf@elektro.pacujo.net> <lrh1jr$u65$1@ger.gmane.org> <mailman.12529.1406937431.18130.python-list@python.org>

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Chris Angelico <rosuav@gmail.com>:

> On Sat, Aug 2, 2014 at 7:42 AM, Terry Reedy <tjreedy@udel.edu> wrote:

>> For mercurial, with no treat model, a 160 bit hash is used. Internet
>> applications need more bits and carefully vetted algorithms to
>> hopefully make the actual principle true.
>
> Ditto git, which also has no threat model.

I don't know why you way hg and git have no threat models. A great deal
of damage could be inflicted if you could sneak malicious edits into
version control systems without altering the hash.

Important systems absolutely rely on the fact that the hashes can be
used for identification. They are not just checksums. They are not
double-checked with bit-to-bit comparisons of the actual data.

Marko

Thread

Re: Dict when defining not returning multi value key error Dan Stromberg <drsalists@gmail.com> - 2014-07-31 20:12 -0700
  Re: Dict when defining not returning multi value key error Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-08-01 04:04 +0000
    Re: Dict when defining not returning multi value key error Ben Finney <ben+python@benfinney.id.au> - 2014-08-01 14:17 +1000
      Re: Dict when defining not returning multi value key error Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-08-01 13:31 +0000
        Re: Dict when defining not returning multi value key error Chris Angelico <rosuav@gmail.com> - 2014-08-01 23:57 +1000
          Re: Dict when defining not returning multi value key error Marko Rauhamaa <marko@pacujo.net> - 2014-08-01 18:39 +0300
            Re: Dict when defining not returning multi value key error Terry Reedy <tjreedy@udel.edu> - 2014-08-01 17:42 -0400
            Re: Dict when defining not returning multi value key error Chris Angelico <rosuav@gmail.com> - 2014-08-02 09:57 +1000
              Re: Dict when defining not returning multi value key error Marko Rauhamaa <marko@pacujo.net> - 2014-08-02 09:41 +0300
                Re: Dict when defining not returning multi value key error Marko Rauhamaa <marko@pacujo.net> - 2014-08-02 10:06 +0300
                Re: Dict when defining not returning multi value key error Chris Angelico <rosuav@gmail.com> - 2014-08-02 20:58 +1000
            Re: Dict when defining not returning multi value key error Steven D'Aprano <steve+comp.lang.python@pearwood.info> - 2014-08-02 11:47 +1000
              Re: Dict when defining not returning multi value key error Chris Angelico <rosuav@gmail.com> - 2014-08-02 12:13 +1000

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