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System Name: libtmcg
Name: LibTMCG
Group Type: non-GNU software and documentation

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This project is not part of the GNU Project.

LibTMCG is a C++ library for creating secure and fair online card games. The library contains a sort of useful classes, algorithms, and high-level protocols to support an application programmer in writing such software.

The most remarkable feature is the absence of a trusted third party, i.e., neither a central game server nor trusted hardware components are necessary. Thus, it is well-suited for peer-to-peer (P2P) environments.

The implementation is based primarily on two academic research papers:
First, Christian Schindelhauer, A Toolbox for Mental Card Games, Technical Report A-98-14, University of L├╝beck, 1998, and second, Adam Barnett, Nigel P. Smart, Mental Poker Revisited, Cryptography and Coding 2003, Lecture Notes in Computer Science 2898, pages 370-383, 2003.

Of course, we cannot avoid that malicious players share information about their private cards, but the protocols ensure that the shuffle of the deck is performed randomly (presumed that at least one player is honest) and thus the cards will be distributed uniformly among the players. Further, no coalition can learn the private cards of a player against his will (except for trivial conclusions). The corresponding cryptographic problem, actually called ``Mental Poker'', has been studied since 1979 (Shamir, Rivest, and Adleman) by many authors. LibTMCG provides the first practical implementation of such protocols.

The security and the verifiability rely on advanced cryptographic techniques---the so-called zero-knowledge proofs. Using these `building blocks' the high-level protocols minimize the effect of coalitions and preserve the confidentiality of the players' strategy, i.e., the players are not required to reveal their cards at the end of the game to show that they did not cheat. This important property is often required in card games like Poker. For many operations of Schindelhauer's toolbox the library provides optimized protocols based on standard cryptographic assumptions like Decisional Diffie Hellman (DDH). Therefore a reasonable level of performance is obtained.

Registration Date: Sat 22 Jan 2005 04:38:29 PM UTC
License: GNU General Public License v2 or later
Development Status: 5 - Production/Stable


Latest News rss feed
LibTMCG 1.3.11 released
     posted by stamer, Fri 09 Feb 2018 03:28:27 PM UTC - 0 replies

Some small enhancements for the OpenPGP interfaces and the library initialization have been implemented. Unfortunately, the changes may require also an update of the application to be effective.

LibTMCG 1.3.10 released
     posted by stamer, Sun 14 Jan 2018 06:13:32 PM UTC - 0 replies

With this release the RSA signature generation/verification for OpenPGP is introduced. Moreover, a function for preparing certification signatures has been added.

LibTMCG 1.3.9 released
     posted by stamer, Sun 24 Dec 2017 08:36:06 AM UTC - 0 replies

This releases fixes two minor bugs in the OpenPGP implementation.

LibTMCG 1.3.8 released
     posted by stamer, Sat 09 Dec 2017 08:08:44 AM UTC - 0 replies

The S2K count for OpenPGP private key encryption has been increased to a reasonable value. Moreover, some additional code fragments (e.g. parsing of OpenPGP packets) have been improved.

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