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International Conference on Digital Telecommunications (ICDT)

Quantum information authentication using entangled states

Xiaoyu Li, Dexi Zhang

Published Sep 22, 2006• 7 citations
Publisher

Abstract

This paper provides a quantum information authentication protocol using entangled states. The two parties share EPR (Einstein-Podolsky-Rosen) pairs as authentication key. Information is coded in two-qubits systems. The two parties confirm the validity of the information by making the coding systems to interact with the authentication key. We prove that information from anyone who has no authentication key can't pass the authentication. So our protocol is secure. If there are no errors and eavesdroppers existing in transmission, the authentication key can be reused

DOI
10.1109/icdt.2006.66

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This paper provides a quantum information authentication protocol using entangled states. The two parties share EPR (Einstein-Podolsky-Rosen) pairs as authentication key. Information is coded in two-qubits systems. The two parties confirm the validity of the information by making the coding systems to interact with the authentication key. We prove that information from anyone who has no authentication key can't pass the authentication. So our protocol is secure. If there are no errors and eavesdroppers existing in transmission, the authentication key can be reused
Abstract: In this paper we provide a quantum authentication protocol. The two parties share a sequence of EPR(Einstein-Podolsky-Rosen) pairs as the authentication key. To authenticate each other, one party creates aux-iliary qubits and make them interact with the authentication key. After measurement in selected basis, he or she affirm the other’s identity. We shown that no one without the authentication key can pass the authentication process. So the protocol is secure. The authentication key is reusable if there are no eavesdroppers and errors in transmis-sion.
A quantum authentication protocol is presented in this paper. It is based on the correlations of the EPR(Einstain- Podolski-Rosen) pair which is a two-qubit system in one of the four Bell states. The two parties share a sequence of EPR pairs as the authentication key. To authenticate each other, they need to create auxiliary particles and make them interact with the authentication key. Then one can affirm the other's identity by performing the Bell states measure- ment. No one without the authentication key can pass the authentication process. So the protocol is secure. No clas- sical channel and classical information exchange is needed in the authentication process. After the authentication pro- cess, the authentication key can be turned into the origin state. So the authentication key can be reused.
In this paper we propose a new protocol for multiparty secret key sharing by using quantum entanglement swapping. Quantum Entanglement swapping is a process that allows two non-interacting quantum systems to be entangled. Further, to increase the security level and to make sure that the users are legitimate, authentication for both parties will be required by a trusted third party. In this protocol, a trusted third party will authenticate the sender and the receiver and help them forming a secret key. Furthermore, the proposed protocol will perform entanglement swapping between the sender and the receiver. The result from the entanglement swapping will be an Einstein-Podolsky-Rosen (EPR) pair that will help them in forming and sending the secret key without having the sender to send any physical quantum states to the receiver. This protocol will provide the required authentication of all parties to the trusted party and it will provide the required secure method in transmitting the secret key.
In this paper we propose a new protocol for multiparty secret key sharing by using quantum entanglement swapping.Quantum Entanglement swapping is a process that allows two non-interacting quantum systems to be entangled.Further, to increase the security level and to make sure that the users are legitimate, authentication for both parties will be required by a trusted third party.In this protocol, a trusted third party will authenticate the sender and the receiver and help them forming a secret key.Furthermore, the proposed protocol will perform entanglement swapping between the sender and the receiver.The result from the entanglement swapping will be an Einstein-Podolsky-Rosen (EPR) pair that will help them in forming and sending the secret key without having the sender to send any physical quantum states to the receiver.This protocol will provide the required authentication of all parties to the trusted party and it will provide the required secure method in transmitting the secret key.
Authentication is a well-studied area of classical cryptography: a sender A and a receiver B sharing a classical secret key want to exchange a classical message with the guarantee that the message has not been modified or replaced by a dishonest party with control of the communication line. In this paper we study the authentication of messages composed of quantum states. We give a formal definition of authentication in the quantum setting. Assuming A and B have access to an insecure quantum channel and share a secret, classical random key, we provide a non-interactive scheme that enables A to both encrypt and authenticate an m qubit message by encoding it into m+s qubits, where the error probability decreases exponentially in the security parameter s. The scheme requires a secret key of size 2m+O(s). To achieve this, we give a highly efficient protocol for testing the purity of shared EPR pairs. It has long been known that learning information about a general quantum state will necessarily disturb it. We refine this result to show that such a disturbance can be done with few side effects, allowing it to circumvent cryptographic protections. Consequently, any scheme to authenticate quantum messages must also encrypt them. In contrast, no such constraint exists classically. This reasoning has two important consequences: It allows us to give a lower bound of 2m key bits for authenticating m qubits, which makes our protocol asymptotically optimal. Moreover, we use it to show that digitally signing quantum states is impossible.