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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


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LibTMCG 1.3.5 released
     posted by stamer, Sun 19 Nov 2017 07:33:30 AM UTC - 0 replies

This is a maintenance release fixing some memory leaks found by Valgrind and some other minor bugs.

LibTMCG 1.3.4 released
     posted by stamer, Fri 10 Nov 2017 06:15:54 AM UTC - 0 replies

The DKG tools have been removed from this release. These programs are continued in a separate package called Distributed Privacy Guard (DKGPG).

LibTMCG 1.3.3 released
     posted by stamer, Mon 30 Oct 2017 03:34:28 PM UTC - 0 replies

Small enhancements for DKG tools have been added, e.g., programs for basic information about a private threshold key (dkg-keyinfo), proactive refresh of a shared tDSS key (dkg-refresh), and verification of a detachted signature (dkg-verify) are now ...

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LibTMCG 1.3.2 released
     posted by stamer, Sun 03 Sep 2017 11:57:53 AM UTC - 0 replies

Major improvements for distributed key generation (DKG) and threshold cryptography have been added. For example, the robust DSA compatible threshold signature scheme of Canetti et al. is now included. LibTMCG contains an implementation (called ...

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