Cryptimeleon Groupsig

The Groupsig library offers interfaces and tests useful for implementing group signatures as well as example implementations in Java 8. The interfaces have largely been derived from [DiaArrRod15].

Security Disclaimer

WARNING: This library is meant to be used for prototyping and as a research tool only. It has not been sufficiently vetted for use in security-critical production environments. All implementations are to be considered experimental.

Implementations

As an example we have implemented the traceable group signature from [ChoParYun06].

Quickstart

Installation

At the moment, Groupsig does not have a release version and needs to be installed by cloning this repository, building the project, and publishing it to your local Maven repository.

To do this, run the following commands:

git clone git@github.com:cryptimeleon/groupsig.git
cd groupsig
./gradlew build
./gradlew publishToMavenLocal

Once you have done this, you can add it as a dependency. You will need to enable dependency resolution for your local Maven repository as well.

Adding Dependency For Maven

To add the newest Groupsig version as a dependency, add this to your project's POM:

<dependency>
    <groupId>org.cryptimeleon</groupId>
    <artifactId>groupsig</artifactId>
    <version>0.1.0</version>
</dependency>

Adding Dependency For Gradle

Groupsig is not published via an online repository. You will need to use the version from your local Maven repository. Therefore, you need to add mavenLocal() to the repositories section of your project's build.gradle file. Then, add implementation group: 'org.cryptimeleon', name: 'groupsig', version: '0.1.0' to the dependencies section of your build.gradle file.

For example:

repositories {
    mavenLocal()
}

dependencies {
    implementation group: 'org.cryptimeleon', name: 'groupsig', version: '0.1.0'
}

Tutorials

Groupsig uses the mathematical facilities of our Math library. Therefore, we recommend you go through our short Math tutorial to get started.

Miscellaneous Information

• Official Documentation can be found here.
  • The For Contributors area includes information on how to contribute.
• Groupsig adheres to Semantic Versioning.
• The changelog can be found here.
• Groupsig is licensed under Apache License 2.0, see LICENSE file.

Authors

The library was implemented at Paderborn University in the research group "Codes und Cryptography".

References

[DiaArrRod15] Jesus Diaz and David Arroyo and Francisco B. Rodriguez (2015). "libgroupsig: An extensible C library for group signatures". https://eprint.iacr.org/2015/1146

[ChoParYun06] Seung Geol Choi, Kunsoo Park, and Moti Yung (2006). "Short Traceable Signatures Based on Bilinear Pairings". In Advances in Information and Computer Security (pp. 88–103). Springer Berlin Heidelberg.