Key management is an essential functionality for developing secure cryptosystems; particularly for implementations to low cost devices of a distributed sensor networks (DSN)–a prototype of Internet of Things (IoT). Low cost leads to constraints in various resources of constituent devices of a IoT (sensors of a DSN); thereby restricting implementations of computationally heavy public key cryptos...

We study the security of Oblivious Random Access Machines (ORAM) in the quantum world. First we introduce a new formal treatment of ORAMs, which is at the same time elegant and simpler than the known formalization by Goldreich and Ostrovsky. Then we define and analyze the notion of post-quantum security for ORAMs, i.e., classical ORAMs resistant against quantum adversaries. We show that merely ...

We proposed a new public key encryption scheme with equality test (PKEET), which stands for a public key encryption scheme with comparable ciphertext. The equivalence among ciphertext under PKEET schemes can be verified without decryption. In some PKEET algorithms like Tang’s AoN-PKEET, which is called authorization-based PKEET, the equality test functionality is restricted to some authorized u...

As a countermeasure for eavesdroppers in wireless communications, a secret key agreement scheme using a variable directional antenna called ESPAR antenna was developed. In this scheme, the process of information reconciliation is necessary to correct the discrepancies between the legitimate users’ keys. In this paper, we propose a new information reconciliation protocol using the reliability of...

Cascade is an information reconciliation protocol proposed in the context of secret key agreement in quantum cryptography. This protocol allows removing discrepancies in two partially correlated sequences that belong to distant parties, connected through a public noiseless channel. It is highly interactive, thus requiring a large number of channel communications between the parties to proceed a...

We present a security analysis against collective attacks for a time-energy entanglement-based quantum key distribution protocol, given the practical constraints of single photon detector efficiency, channel loss, and finite-key considerations. We find a positive secure-key capacity when the key length increases beyond 104 for eight-dimensional systems. The minimum key length required is reduce...