Re: Complex Theoretical One Way Hash Question
 From: daw@xxxxxxxxxxxxxxxxxxxxxxxx (David Wagner)
 Date: Tue, 18 Apr 2006 15:23:01 +0000 (UTC)
Matthew Harrison wrote:
I wish to know if it is possible to embed an MD5 of an image (e.g. a
JPEG) in the image such that the MD5 is human readable in the image AND
is an MD5 of the modified image including the readable MD5.
I don't know of any way to do this. This would probably require breaking
the security (in particular, the onewayness) of MD5. The problem is
that the hash depends on every bit of the image; but some bits of the
image depend on the hash; so you have a circular dependency that there
doesn't seem to be any easy way to break.
.
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