A Secure Communication Scheme Directly on Quantum Channel
Date Issued
2010
Date
2010
Author(s)
Chang, Ting-Hsu
Abstract
This paper provides a new quantum communication scheme based on QKD protocol, BB84, to transport data directly on quantum channel, but not on classical channel. On quantum channel, it can be guaranteed that eavesdropper never get correct information. This is a very important difference compared with the traditional method which has to use the one-time pad to encrypt data. In order to transport data directly on quantum channel, Alice and Bob have to share a common set of secrete keys and a common set of measurement bases established by the BB84 protocol. Alice can encrypt the data with common secrete keys and transport it directly on quantum channel according to the common measurement bases. Bob uses the same measurement bases to get the cipher text and decrypt it using the same secrete keys(S1) to get the information which Alice wants to convey. The method to detect the eavesdropper on the quantum channel is based on the error-rate. Therefore, we use a special coding method to correct a one-bit error and detect multi-bit errors. If multi-bit errors happen, we think that there is someone eavesdropping on the quantum channel. In this situation, we need to transport the data again using the new common secrete keys and the common measurement bases. If it is not, Alice transports the next data repeatedly using the same common secrete keys and common measurement bases. This method is simpler and faster than the one-time pad method using BB84 protocol because this method transports data directly on quantum channel, from which the eavesdropper can’t get correct the information of the transported cipher text and eavesdrop without being detected.
Subjects
Quantum Key Distribution, QKD
One-Time Pad Encryption
QKD Protocol
Secure Communication
Quantum Channel
Unconditional Security
Type
thesis
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