Visual Cryptography

Visual Cryptography
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Subject Author Date
Visual Cryptography Jyothirmai 11-09-2005
`--> Re: Visual Cryptography Juergen Nievele...11-09-2005
Posted by Jyothirmai on November 9, 2005, 9:16 am
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Hi,

I have read in "Visual Cryptography", how an image can be reconstructed
"visually" by superimposing two shares. But I have not understood how
this can help in authenticating a user?

Are there any practical implementations of this technique? If so, how do
they deal with the probelm of sending the image across the wire, securely?

Can someone explain this.

Thanks in advance.

-J


Posted by 0xception on November 9, 2005, 8:45 am
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Yeah there is a very good electronic voting machine that implements
visual cryptography....
see PDF: http://www.voterverifiable.com/article.pdf

This doesn't actually authenticate the user but it shows a good
implementation... this is secure because even if you send the image
across the wire it is only half of of the image. you need the other
half to understand it.

look into xor encryption for more information on the security of that..
it's basically just a visual xor encryption



Posted by Juergen Nieveler on November 9, 2005, 5:58 pm
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> I have read in "Visual Cryptography", how an image can be
> reconstructed "visually" by superimposing two shares. But I have not
> understood how this can help in authenticating a user?

It authenticates the user as "the person who has the other part of the
picture".

Juergen Nieveler
--
Linux: The smack in the face that Windows gripers have been begging for
these past 10 years...


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