Re: Complex Theoretical One Way Hash Question
- From: Sebastian Gottschalk <seppi@xxxxxxxxx>
- Date: Tue, 18 Apr 2006 15:47:10 +0200
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.
That is - if I execute an MD5 hash sum off the entire image, that MD5
has will be the same as the MD5 shown in human readable format in the
image (I don't mean a JPEG tag, I mean literally on the image canvas
itself).
The questions:
1. Is it theoretically possible ?
Yes.
2. Is it feasible ?
No, as it would allow to create a collision, violating the goal of a
cryptographic hash.
3. Has it already been done ?
Unlikely.
4. Would other one way hash algorithms be more suited ?
CRC and any other unsafe hash would be suitable.
E-Mail me on sci.crypt@xxxxxxxxxxx
hehe... spammers have automated such replacements since years! ;-D
.
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