[Cryptography] Possible SHA2 vulnerability

[Phillip Hallam-Baker]

On Wed, Jun 28, 2017 at 12:09 PM, Ron Garret <ron at flownet.com> wrote:

>
> On Jun 28, 2017, at 9:00 AM, Ron Garret <ron at flownet.com> wrote:
>
> > https://github.com/laie/WorldsFirstSha2Vulnerability
>
> Turns out to be a false alarm.
>
> https://crypto.stackexchange.com/questions/48580/fixed-
> point-of-the-sha-256-compression-function
>
> Oh well, learn something new every day.
>

​I am confused. Since when did SHA-256 have an ​initialization vector?

If IV input to the MD construction and the output are the same for any
block input, construction of an arbitrary number of collisions is trivial
since H (X) = H (X+X) = H (X+X ... X)

What is being shown here?
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://www.metzdowd.com/pipermail/cryptography/attachments/20170629/5e0271a3/attachment.html>