Lattice-Based Secure Authentication Scheme for Cloud Storage

With the rapid development of the computing paradigm, cloud computing becomes the most notable one that offers convenient and on-demand services from a shared pool of configurable computing resources. However, the application of quantum computers in clouds would be realized from the recent breakthrough results of quantum computers. In the near future, existing conventional hardness-based authentication schemes will be confronted with quantum attackers. Lattice-based authentication scheme resolves this tension. Albeit, existing lattice-based schemes, users and cloud servers are always worried about the communication privacy against misbehaved private key generator referred to as mPKG since PKG potentially has the power to generate the secret key for any given identity. In this paper, we proposed a secure authentication scheme for cloud storage that thwarts the misbehaved PKG. We integrate the identity-based encryption (IBE) scheme with the lattice-based signature, which is the variant of existing IBE-based authentication schemes and post-quantum secure. Additionally, we integrate identity certifying authority (ICA) with PKG to ensure security against misbehaved PKG. Our comprehensive security proof demonstrates that the proposed scheme provides stronger security guarantees against misbehaved PKG and ICA.