A new framework for implementing identity-based cryptosystems

• A state of art of existing protocols and practical implementations in the field of identity-based encryption (IBE).
• The first framework for easy implementation of IBE cryptosystems, in particular the distributed protocols.
• New modular design approach.
• Highly effcient implementation.

Identity-Based Encryption (IBE) suffers from the problem of trust in the Private Key Generator (PKG), which translates into the ability of the PKG to produce and distribute multiple private keys or multiple copies of a single key without knowledge of the genuine user. This problem makes the deployment of these systems limited to areas where trust in the PKG must have a high level. Many works addressed this problem and proposed a wide range of key generation protocols which grew from simple protocols run between user and PKG to complex and interactive protocols involving distributed computations. However, the implementation of such complex protocols requires much programming efforts and the few existing tools and libraries deal with special case protocols.In this paper, we present the first complete, efficient and modular framework, composed of a set of libraries, which brings together the most known techniques of private-key generation for identity-based cryptosystems. Our framework aims at providing robust tools designed in a modular and reusable manner to allow developers to implement the latest results coming from theoretical cryptography.