Re: (ichimunki) Re x 3: Digital Signatures on Web Pages

The real fun is how to sign the image (or other binary file) outside the web page without altering the image file (so that non-compliant viewer programs could still display the image).

Some graphics formats allow comments, e.g. gif

I suppose if you wanted to get really fun, you could mess with the least significant bits.

andy.

Comment on Re: (ichimunki) Re x 3: Digital Signatures on Web Pages

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Re: Re: (ichimunki) Re x 3: Digital Signatures on Web Pages by blakem (Monsignor) on Sep 22, 2001 at 03:59 UTC
mess with the least significant bits I thought about that too, but then you are fiddling around with the exact data you are attempting to hash.... I suppose you could make a hash from all the bits excluding those reserved for storing the hash, but that sounds quite hairy. -Blake	[reply]
Re: Re: Re: (ichimunki) Re x 3: Digital Signatures on Web Pages by andye (Curate) on Sep 22, 2001 at 14:59 UTC
I thought about that too, but then you are fiddling around with the exact data you are attempting to hash.... heh. good point. A little hairy, yes. ;/ andy.	[reply]