Broadcast encryption

From	Roedy Green <see_website@mindprod.com.invalid>
Newsgroups	comp.lang.java.security
Subject	Broadcast encryption
Date	2014-05-14 02:28 -0700
Organization	Canadian Mind Products
Message-ID	<3ld6n9dgr5no7u9lh5524tvbi8du3om0m7@4ax.com> (permalink)

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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?

-- 
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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