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Possibily relevant paper: Revocation and Tracing Schemes for Stateless Receivers by Dalit Naor Moni Naor Jeff Lotspiech. -- JesseW, the juggling janitor 22:14, 12 January 2007 (UTC)

thanks, I included it. -- MarioS ( talk) 15:02, 27 September 2012 (UTC) reply

Lol, already had the ref in the new article text that I prepared without noticing this comment. Sorry for the edit conflict, btw, I was sitting on the edit window for far too long. Cheers, Nageh ( talk) 16:47, 27 September 2012 (UTC) reply