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Latest News Approved - With Summaries
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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Distributed Key Generation and Threshold Decryption for OpenPGP
     posted by stamer, Fri 02 Jun 2017 07:56:50 PM UTC - 0 replies

LibTMCG now contains experimental support of Distributed Key Generation (DKG) and Threshold Decryption for the ElGamal Cryptosystem. There is some basic integration for OpenPGP (RFC 4880). However, for the message exchange of DKG protocol ...

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LibTMCG 1.3.1 released
     posted by stamer, Thu 25 May 2017 06:58:39 PM UTC - 0 replies

Small enhancements have been added. In particular, the class VSSHE now provides a simple variant of SetupGenerators_publiccoin().

LibTMCG 1.3.0 released
     posted by stamer, Sat 13 May 2017 06:06:02 PM UTC - 0 replies

This is mainly a bugfix release that removes some issues found by Coverity Scan. However, there are also some new undocumented protocols and experimental support for distributed key generation (DKG) has been added. The most important change is a verifiable setup of VTMF group generator. For some advanced protocols (e.g. Groth's shuffle) with more than two parties the distributed coin flipping protocol (EDCF) should be used.

LibTMCG 1.2.0 released
     posted by stamer, Sat 31 Dec 2016 04:29:51 PM UTC - 0 replies

After a year of work we proudly present LibTMCG 1.2.0.

The default security parameters have been updated to current state of the art. The complexity of hash function g() was improved. Unfortunately, this breaks compatibility with instances that have been compiled with older versions of LibTMCG. ...

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LibTMCG 1.1.3 released
     posted by stamer, Fri 25 Dec 2015 08:56:47 PM UTC - 0 replies

We have just released LibTMCG 1.1.3. It contains new classes and methods for the so-called VRHE scheme, i.e. an efficient zero-knowledge argument for verifiable rotations (cyclic shuffle) whenever the VTMF card encoding is used. A test program ist also included.

Our source code repository moved to git
     posted by stamer, Tue 21 Jul 2015 10:47:32 PM UTC - 0 replies

The project has moved it's master source code repository from CVS to git. You can clone the repository by the following line:

git clone git://

LibTMCG 1.1.2 released
     posted by stamer, Fri 07 Aug 2009 06:48:40 AM UTC - 0 replies

This is a bugfix release created in order to deal with C++ namespace changes of GCC 4.3.x. No new features have been added.

RPM packages available
     posted by stamer, Sat 12 May 2007 10:37:28 AM UTC - 0 replies

Toni Graffy (PackMan team) has kindly provided RPM packages for SuSE Linux 10.0, 10.1, and openSuSE 10.2. The packages are available on and in the PackMan repository as well.

LibTMCG 1.1.1 released
     posted by stamer, Sat 05 May 2007 03:35:25 PM UTC - 0 replies

A major security bug (missing range check) was fixed, which allows an adversary to choose trivial group generators. This flaw has a crucial impact on the confidentiality of private cards. Thus, we strongly recommend all users to update LibTMCG as soon as possible.

Older News Approved
LibTMCG 1.1.0 released posted by stamer, Mon 16 Apr 2007 11:40:24 AM UTC - 0 replies
LibTMCG 1.0.1 released posted by stamer, Fri 06 Apr 2007 07:45:08 AM UTC - 0 replies
Release of LibTMCG 1.0.0 posted by stamer, Thu 13 Apr 2006 05:55:08 AM UTC - 0 replies
Research paper on LibTMCG available posted by stamer, Wed 23 Nov 2005 08:13:18 PM UTC - 0 replies
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