1. Human crypto rump session CR ‘05 Jean-Jacques Quisquater Human crypto rump session CR ‘05 Jean-Jacques Quisquater Human-oriented encryption: from Solitaire to Multitaire Jean-Jacques Quisquater and BoF participants UCL Crypto Group Université catholique de Louvain jjq@dice.ucl.ac.be http://uclcrypto.org August 16, 2005 Rump session Crypto

2. Human crypto rump session CR ‘05 Jean-Jacques Quisquater Human crypto rump session CR ‘05 Jean-Jacques Quisquater Solitaire (Bruce Schneier)  http://www.schneier.com/solitaire.htmlhttp://www.schneier.com/solitaire.html  Solitaire gets its security from the inherent randomness in a shuffled deck of cards. By manipulating this deck, a communicant can create a string of "random" letters that he then combines with his message. Of course Solitaire can be simulated on a computer, but it is designed to be implemented by hand.  Solitaire may be low-tech, but its security is intended to be high-tech.

3. Human crypto rump session CR ‘05 Jean-Jacques Quisquater Human crypto rump session CR ‘05 Jean-Jacques Quisquater BoF, this afternoon  Ten people discussed during one hour,  How to improve,  How to use many people not only one.

4. Human crypto rump session CR ‘05 Jean-Jacques Quisquater Human crypto rump session CR ‘05 Jean-Jacques Quisquater Ideas  Use pro magicians in order to perform very good and reproductible shuffles  Brent Morris (NSA) likes to say that he's the only person with a doctorate in card shuffling  Diaconis, P., R.L. Graham, and W.M. Kantor. 1983. The mathematics of perfect shuffles. Advances in Applied Mathematics 4:175.  Morris, S.B. 1998. Magic Tricks, Card Shuffling, and Dynamic Computer Memories: The Mathematics of the Perfect Shuffle. Washington, D.C.: Mathematical Association of America.

5. Human crypto rump session CR ‘05 Jean-Jacques Quisquater Human crypto rump session CR ‘05 Jean-Jacques Quisquater

6. Human crypto rump session CR ‘05 Jean-Jacques Quisquater Human crypto rump session CR ‘05 Jean-Jacques Quisquater More techniques  Using automata theory (life game of Conway?)  Simulating a large nonlinear feedback register by using a lot of people around a table and cards for storing and communicating information (flipping card): here a lot of problems appear and many optimisations are possible  Random generation?  Use of other games (Chess, Go,...?),

7. Human crypto rump session CR ‘05 Jean-Jacques Quisquater Human crypto rump session CR ‘05 Jean-Jacques Quisquater Conclusions  Many open problems.  Performances, new criteria of design, taxonomy,...  But is it useful?  Yes, creating a funny BoF and giving a rump talk. Thanks to the participants. More next year.