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27.6.2006 - More on crypto and online casinos

Cory Doctorow: EFF Staff Technologist Seth Schoen send in this brief, fascinating primer on the cryptography of secure gambling. This is in response to an earlier post about an online blackjack service that publishes cryptographic hashes of its decks in order to "prove their honesty." It's odd that they claim that "Multiplayer Blackjack at The Gold Casino is without question the most honest possible Blackjack currently on the planet". The computer science literature has been interested for years in the possibility of making distributed card games fair without special hardware, using only cryptographic protocols. Rivest, Shamir, and Adleman wrote a joint paper on mental poker , which is great reading, and the literature has continued from there with various improvements and enhancements. This was, as far as I know, the genesis of the cryptographic subfield of "security multiparty computation". This casino's protocol is _not_ the most verifiably fair known; an enhanced cryptographic "mental poker " protocol would be fairer because it would also prevent deck-stacking. Here is just one random recent example via CiteSeer. On the other hand, all of the crypto protocols for mental poker  seem to require special software just to _play_. This casino requires only a normal web browser to play, but requires special software to audit. A casino could create a Java applet that implements a fair gambling crypto protocol and lets you play in a regular Java-enabled web browser. They could publish the source code to the applet for audit and also show that the compiler the used produces the exact Java bytecode with the same source file as input. (Or, if players wanted to, they could compile the Java applet for themselves and use their locally-compiled versions.) The source could verifiably include features to detect if the house is cheating. The user interface can be precisely the same as that of the existing web-based casino. A basic part of the original mental poker  problem is how to let two people shuffle a deck so that both of them agree that the deck was fairly shuffled and not stacked. The fact that this casino does not address this problem (but still relies on fancy crypto) suggests that it didn't try too hard to investigate what's known in the literature... ( Thanks, Seth!)

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