Semi-device-independent quantum protocols realize information tasks – e.g. secure key distribution, random access coding, and randomness generation – in a scenario where no assumption on the internal working of the devices used in the protocol is made, except their dimension. These protocols offer two main advantages: first, their implementation is often less demanding than fully-device-indepen...

We investigate the secure connectivity of wireless sensor networks under the random key distribution scheme of Eschenauer and Gligor. Unlike recent work which was carried out under the assumption of full visibility, here we assume a (simplified) communication model where unreliable wireless links are represented as on/off channels. We present conditions on how to scale the model parameters so t...

We report on a complete experimental implementation of a quantum key distribution protocol through a free space link using polarization-entangled photon pairs from a compact parametric down-conversion source. Over 10 hours of uninterrupted communication between sites 1.5 km apart, we observe average key generation rates of 630 per second after error correction and privacy amplification. Our sch...

A random key pre-distribution scheme based on key updating (RKKU) was proposed, which is effective in wireless sensor networks. Firstly, the base station will randomly distribute some keys, a hash function and some code slices to each node. Furthermore, the RKKU scheme compares with the information of some random key to find the same key, and computes the communication key between two sensor no...

Operating systems and applications rely on random number generators (RNGs) for a number of important tasks, most notably cryptographic key generation. The impact of flawed random number generation practices has been studied extensively in the past [2, 5]. In this paper, we examine the implications of an RNG bug in FreeBSD that was fixed by Subversion commit r278907 [3]. In particular, our analy...

We Haar uniformly generate random states of various ranks and study their performance in an entanglement-based quantum key distribution (QKD) task. In particular, we analyze the efficacy two-qubit realizing device-independent (DI) QKD. first find normalized entanglement Bell-nonlocality which are resource for DI-QKD ranging from rank-1 to rank-4. The number entangled as well Bell-nonlocal decre...

Random Numbers determine the security level of cryptographic applications as they are used to generate padding schemes in the encryption/decryption process as well as used to generate cryptographic keys. This paper utilizes the QKD to generate a random quantum bit rely on BB84 protocol, using the NIST and DIEHARD randomness test algorithms to test and evaluate the randomness rates for key gener...

Key technological advances in wireless communications, Micro Electro Mechanical Systems (MEMS), and digital circuitry have energized the research community to focus on the challenges of wireless sensor networks. In this paper, we propose a new pre-distribution key management scheme that meets the operational and security requirements of wireless sensor networks and provide authentication and ke...