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Quantum cryptography is proposed as a big revolution in IT security, even some theoretical studies considered that the exploitation of quantum physics features can enable us to get unconditional security. With the passage of time, appeared the quantum cryptanalysis which includes in the beginning a collection of theoretical quantum hacking strategies. However, the implementation of quantum key distribution protocols (QKD) showed several vulnerabilities in quantum cryptography scheme, which exploited to spy on the quantum communication. Therefore, the engineering implementation of QKD protocols showed a significant difference between the theoretical promises and experiment results. In order to make QKD protocols more applicable in real security solutions, we analyze in this contribution the variation of the security level of QKD protocols between the quantum theory and the implementation phase. In the same context, we focus on the quantum attacks via exploiting the vulnerabilities of classical devises using in the implementation phase and these impact on the security level of QKD.

One of the most fundamental choices to store the big data it’s the use of unstructured databases. However, the classical algorithms used in NoSQL databases suffer from slow execution of orders, especially in search operations. In order to decrease the data time processing in general and more particularly the search period in unstructured databases, we suggest in this work the use of a quantum approach based on Grover’s algorithm.

Contrary to classical computer which store data using the digital bits 0 or 1, quantum computer use quantum bits (qubits) for coding information as O, 1, or 01 at the same time. In fact this superposition of states with the other quantum phenomena enables quantum computers to operate vast combinations of states at once. In this study, we analyze the impact of quantum computing in the simplification of classical computing complexities using in computer science. In fact, we focus on the effectiveness of quantum algorithms in different filed classical computer.