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Synful Knock questions...
- Subject: Synful Knock questions...
- From: jake.mertel at ubiquityhosting.com (Jake Mertel)
- Date: Tue, 15 Sep 2015 13:37:26 -0700
- In-reply-to: <[email protected]>
- References: <[email protected]> <CAOhg=RzdgyUOF5t_4vba5Voxy9tr6W-_sgFdEzu9r7RDrajAbA@mail.gmail.com> <CAOe-DYDdGBDFgxjuHGk_kdN_jR6-Er+ytfz9-Ad-Fm=YquqBzA@mail.gmail.com> <CAOhg=RzB-+r5zxq3doWktLdfs1qTgd4yUaQgX9QSdkyg01_oew@mail.gmail.com> <[email protected]>
My apologies, Valdis is indeed correct, I did not mean to suggest that it
would be possible to make modifications in such a way that would result in
an identical checksum. Sorry for the confusion and extra noise.
--
Regards,
Jake Mertel
Ubiquity Hosting
*Web: *https://www.ubiquityhosting.com
*Phone (direct): *1-480-478-1510
*Mail:* 5350 East High Street, Suite 300, Phoenix, AZ 85054
On Tue, Sep 15, 2015 at 1:01 PM, <Valdis.Kletnieks at vt.edu> wrote:
> On Tue, 15 Sep 2015 11:54:30 -0700, Jake Mertel said:
> > Indeed -- While there are methods that can be used to "pack" a file so
> that
> > it collides with a desirable checksum, that would be nearly impossible to
> > do in this scenario.
>
> Small clarification here.
>
> There are known methods to easily produce two files that have the same MD5
> hash, but you have no control over the checksum.
>
> There are not (to my knowledge) ways to tweak a file to produce a specified
> MD5 hash. MD5 is broken, but not *that* broken (yet). Feel free to point
> me at papers if it's been done.
>
> There are ways to easily produce a file with a specified
> non-crypto-strength
> hash like a CRC-32.
>
> So it really matters to be clear on what algorithm is used for the
> checksum/hash.
>