Predenc

The Cryptimeleon Predenc project contains various predicate encryption implementations such as attribute-based encryption or identity-based encryption. Furthermore, it contains key encapsulation mechanisms based on predicate encryption schemes.

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.

Implemented Schemes

• Encryption schemes:
  • Attribute-based:
    • Waters' ciphertext-policy attribute-based encryption scheme [Wat11]
    • Goyal et al.'s key-policy attribute-based encryption scheme [GPSW06]
  • Identity-based:
    • Fuzzy identity-based encryption [SW05]
    • Identity based encryption from the Weil pairing [BF01]
• Key encapsulation mechanisms (KEM): We implement several KEMs based on the encryption schemes implemented in this library. Predenc provides KEMs for [Wat11], [GPSW06] and [SW05].

Quickstart

Installation With Maven

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

<dependency>
    <groupId>org.cryptimeleon</groupId>
    <artifactId>predenc</artifactId>
    <version>1.0.1</version>
</dependency>

Installation With Gradle

Predenc is published via Maven Central. Therefore, you need to add mavenCentral() to the repositories section of your project's build.gradle file. Then, add implementation group: 'org.cryptimeleon', name: 'predenc', version: '1.0.1' to the dependencies section of your build.gradle file.

For example:

repositories {
    mavenCentral()
}

dependencies {
    implementation group: 'org.cryptimeleon', name: 'predenc', version: '1.0.1'
}

Tutorials

Predenc 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.
• Predenc adheres to Semantic Versioning.
• The changelog can be found here.
• Predenc 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

[BF01] Dan Boneh and Matt Franklin. "Identity-Based Encryption from the Weil Pairing". In: Advances in Cryptology — CRYPTO 2001. CRYPTO 2001. Ed. by Joe Kilian. Vol. 2139. Lecture Notes in Computer Science. Springer, Berlin, Heidelberg, August 2001, pp. 213-229.

[SW05] Amit Sahai and Brent Waters. "Fuzzy Identity-Based Encryption". In: Advances in Cryptology – EUROCRYPT 2005 (pp. 457–473). Springer Berlin Heidelberg.

[GPSW06] Vipul Goyal, Omkant Pandey, Amit Sahai, and Brent Waters. "Attribute-based encryption for fine-grained access control of encrypted data". In: ACM Conference on Computer and Communications Security. ACM, 2006, pages 89–98.

[Wat11] Brent Waters. Ciphertext-policy attribute-based encryption: An expressive, efficient, and provably secure realization. In Public Key Cryptography. Springer, 2011, pp. 53–70.