Path: csiph.com!v102.xanadu-bbs.net!xanadu-bbs.net!feeder.erje.net!eu.feeder.erje.net!news.albasani.net!news.luga.at!.POSTED!not-for-mail From: "Peter J. Holzer" Newsgroups: comp.lang.java.security Subject: Re: Broadcast encryption Date: Thu, 15 May 2014 12:13:44 +0200 Organization: LUGA Lines: 27 Message-ID: References: <3ld6n9dgr5no7u9lh5524tvbi8du3om0m7@4ax.com> NNTP-Posting-Host: medium.hjp.at Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Trace: cherenkov.luga.at 1400149204 9112 2001:15c0:65ff:8763::8 (15 May 2014 10:20:04 GMT) X-Complaints-To: abuse@luga.at NNTP-Posting-Date: Thu, 15 May 2014 10:20:04 +0000 (UTC) User-Agent: slrn/pre1.0.0-40 (Linux) Xref: csiph.com comp.lang.java.security:292 On 2014-05-14 09:28, Roedy Green wrote: > 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? > Public Key crypto. hp -- _ | Peter J. Holzer | Fluch der elektronischen Textverarbeitung: |_|_) | | Man feilt solange an seinen Text um, bis | | | hjp@hjp.at | die Satzbestandteile des Satzes nicht mehr __/ | http://www.hjp.at/ | zusammenpaßt. -- Ralph Babel