Study on optical fiber communication of the physical cipher beyond the Shannon limit

2016 Fiscal Year Final Research Report

• Project/Area Number: 15K13991
• Research Category: Grant-in-Aid for Challenging Exploratory Research
• Allocation Type: Multi-year Fund
• Research Field: Communication/Network engineering
• Research Institution: Tamagawa University
• Principal Investigator: Futami Fumio 玉川大学, 量子情報科学研究所, 教授 (20417695)
• Project Period (FY): 2015-04-01 – 2017-03-31
• Keywords: 暗号のシャノン限界 / 物理暗号 / 光ファイバ通信

Outline of Final Research Achievements

Today, the data traffic including the sensitive data is rapidly increasing. An encryption key is required for secure communication and an efficient use of the key is an issue for huge amount of data. The physical cipher has a possibility to realize an efficient use of the key which provides the security beyond the Shannon limit of the cryptography. For realizing such physical cipher, we have proposed a novel scheme employing phase modulation in the frequency domain. An experimental demonstration of encryption and decryption using shared keys have been successfully conducted using 10-Gb/s optical signal at the wavelength of 1.5 micron. In addition, we have successfully applied the novel scheme to an optical fiber transmission over 120 km. This result will give a great advance to realize a physical cipher beyond the Shannon limit of the cryptography.

Free Research Field

工学