Re: Broadcast encryption

From	Roedy Green <see_website@mindprod.com.invalid>
Newsgroups	comp.lang.java.security
Subject	Re: Broadcast encryption
Date	2014-05-14 02:54 -0700
Organization	Canadian Mind Products
Message-ID	<q7f6n9l9e9ij7ovucm2kp34mt6vnod73og@4ax.com> (permalink)
References	<3ld6n9dgr5no7u9lh5524tvbi8du3om0m7@4ax.com>

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On Wed, 14 May 2014 02:28:54 -0700, Roedy Green
<see_website@mindprod.com.invalid> wrote, quoted or indirectly quoted
someone who said :

>Here is what I would like to do.
>
>I assign each of my "spies" a key of some sort.
>
>I create a common file that gets sent to all the spies.
>
>However, it is encrypted in some way I don't even know is possible,
>but only m of the n spies can decrypt it.
>
>
>I don't want the  overhead of having to prepare and send a different
>file for each spy.
>
>Have you ever heard of such a thing?

one way to do it would be to encrypt with a random key. then tack on
the key encrypted for each legit viewer with that viewer's public key.

-- 
Roedy Green Canadian Mind Products http://mindprod.com
Culture is your operating system. 
~ Terence McKenna (born: 1946-11-16 died: 2000-04-03 at age: 53)

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Broadcast encryption Roedy Green <see_website@mindprod.com.invalid> - 2014-05-14 02:28 -0700
  Re: Broadcast encryption Roedy Green <see_website@mindprod.com.invalid> - 2014-05-14 02:54 -0700
  Re: Broadcast encryption "Peter J. Holzer" <hjp-usenet3@hjp.at> - 2014-05-15 12:13 +0200

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