Patents by Inventor Xiuzhong CHEN
Xiuzhong CHEN has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 10757083Abstract: A quantum key distribution system includes a quantum security key management (QSKM) device, a plurality of quantum security key distribution (QSKD) devices, and a quantum security key service (QSKS) device. The QSKD device splits an identity-based system private key into a plurality of system sub-private keys, and distributes the plurality of system sub-private keys to a corresponding number of the QSKD devices. The QSKS device forwards a request for acquiring an authorized private key from a first QSKD device to a predetermined number of second QSKD devices. The predetermined number of second QSKD devices each generate an identity-based authorized sub-private key from the system sub-private key. The first QSKD device acquires, from the predetermined number of second QSKD devices, the identity-based authorized sub-private keys, and reconstructs an identity-based authorized private key based on the identity-based authorized sub-private keys.Type: GrantFiled: May 21, 2019Date of Patent: August 25, 2020Assignee: ALIBABA GROUP HOLDING LIMITEDInventors: Yingfang Fu, Shuanlin Liu, Yabin Gao, Xiuzhong Chen
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Publication number: 20190281034Abstract: A quantum key distribution system includes a quantum security key management (QSKM) device, a plurality of quantum security key distribution (QSKD) devices, and a quantum security key service (QSKS) device. The QSKD device splits an identity-based system private key into a plurality of system sub-private keys, and distributes the plurality of system sub-private keys to a corresponding number of the QSKD devices. The QSKS device forwards a request for acquiring an authorized private key from a first QSKD device to a predetermined number of second QSKD devices. The predetermined number of second QSKD devices each generate an identity-based authorized sub-private key from the system sub-private key. The first QSKD device acquires, from the predetermined number of second QSKD devices, the identity-based authorized sub-private keys, and reconstructs an identity-based authorized private key based on the identity-based authorized sub-private keys.Type: ApplicationFiled: May 21, 2019Publication date: September 12, 2019Inventors: Yingfang Fu, Shuanlin Liu, Yabin Gao, Xiuzhong Chen
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Patent number: 10389525Abstract: A method and apparatus for quantum key distribution comprised of a privacy amplification method and device for the quantum key distribution process as well as a data transmission method and system based on quantum keys is provided, wherein the quantum key distribution method includes the following process: obtaining a bit stream of the same basis vector by sending or receiving coding quantum states of random bit streams and comparing those measurements obtained with the measurement basis vector; in accordance with a preset manner, extracting parameter information associated with privacy amplification and initial key information from the bit stream of the same basis vector after error correction; and using the initial key as an input to implement the privacy amplification algorithm based on the parameter information and thereby obtain shared quantum keys.Type: GrantFiled: October 30, 2015Date of Patent: August 20, 2019Assignee: Alibaba Group Holding LimitedInventors: Yingfang Fu, Shuanlin Liu, Yabin Gao, Li Xiao, Junying Pang, Xiuzhong Chen, Liang Feng
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Patent number: 10348493Abstract: A quantum key distribution system is provided. The quantum key distribution system includes a plurality of routing devices configured to relay keys and a quantum key distribution device connected with the routing devices and configured to use two or more different paths to perform corresponding quantum key negotiations with another quantum key distribution device to obtain shared keys. The two or more different paths each include one or more of the routing devices.Type: GrantFiled: January 6, 2016Date of Patent: July 9, 2019Assignee: ALIBABA GROUP HOLDING LIMITEDInventors: Yingfang Fu, Shuanlin Liu, Yabin Gao, Xiuzhong Chen
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Patent number: 10305873Abstract: A quantum key distribution system includes a quantum security key management (QSKM) device, a plurality of quantum security key distribution (QSKD) devices, and a quantum security key service (QSKS) device. The QSKD device splits an identity-based system private key into a plurality of system sub-private keys, and distributes the plurality of system sub-private keys to a corresponding number of the QSKD devices. The QSKS device forwards a request for acquiring an authorized private key from a first QSKD device to a predetermined number of second QSKD devices. The predetermined number of second QSKD devices each generate an identity-based authorized sub-private key from the system sub-private key. The first QSKD device acquires, from the predetermined number of second QSKD devices, the identity-based authorized sub-private keys, and reconstructs an identity-based authorized private key based on the identity-based authorized sub-private keys.Type: GrantFiled: January 12, 2016Date of Patent: May 28, 2019Assignee: ALIBABA GROUP HOLDING LIMITEDInventors: Yingfang Fu, Shuanlin Liu, Yabin Gao, Xiuzhong Chen
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Patent number: 10142015Abstract: A method and device for detecting shared risk link groups is disclosed. The method comprises injecting a probe beam, respectively, into a first test link and a second test link. The method further includes recording, respectively, a first curve of a time-varying first power corresponding to the first backlight and a second curve of a time-varying second power corresponding to the second backlight; calculating a resemblance value for the first curve and the second curve; and judging, based on the resemblance value, whether the first test link and the second test link are located in the same shared risk link group. The method and device for detecting shared risk link groups provided by embodiments of the present invention detect by testing a power characteristic of backlight of a probe beam in test links and, based on that one-dimensional power characteristic, judge whether the test links are in the same shared risk link group, which are simpler in application than those in the prior art.Type: GrantFiled: February 3, 2016Date of Patent: November 27, 2018Assignee: Alibaba Group Holding LimitedInventors: Xiuzhong Chen, Chongjin Xie, Junying Pang
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Publication number: 20160248581Abstract: A quantum key distribution system is provided. The quantum key distribution system includes a plurality of routing devices configured to relay keys and a quantum key distribution device connected with the routing devices and configured to use two or more different paths to perform corresponding quantum key negotiations with another quantum key distribution device to obtain shared keys. The two or more different paths each include one or more of the routing devices.Type: ApplicationFiled: January 6, 2016Publication date: August 25, 2016Inventors: Yingfang FU, Shuanlin LIU, Yabin GAO, Xiuzhong CHEN
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Publication number: 20160241333Abstract: A method and device for detecting shared risk link groups is disclosed. The method comprises injecting a probe beam, respectively, into a first test link and a second test link. The method further includes recording, respectively, a first curve of a time-varying first power corresponding to the first backlight and a second curve of a time-varying second power corresponding to the second backlight; calculating a resemblance value for the first curve and the second curve; and judging, based on the resemblance value, whether the first test link and the second test link are located in the same shared risk link group. The method and device for detecting shared risk link groups provided by embodiments of the present invention detect by testing a power characteristic of backlight of a probe beam in test links and, based on that one-dimensional power characteristic, judge whether the test links are in the same shared risk link group, which are simpler in application than those in the prior art.Type: ApplicationFiled: February 3, 2016Publication date: August 18, 2016Inventors: Xiuzhong CHEN, Chongjin XIE, Junying PANG
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Publication number: 20160226846Abstract: A quantum key distribution system includes a quantum security key management (QSKM) device, a plurality of quantum security key distribution (QSKD) devices, and a quantum security key service (QSKS) device. The QSKD device splits an identity-based system private key into a plurality of system sub-private keys, and distributes the plurality of system sub-private keys to a corresponding number of the QSKD devices. The QSKS device forwards a request for acquiring an authorized private key from a first QSKD device to a predetermined number of second QSKD devices. The predetermined number of second QSKD devices each generate an identity-based authorized sub-private key from the system sub-private key. The first QSKD device acquires, from the predetermined number of second QSKD devices, the identity-based authorized sub-private keys, and reconstructs an identity-based authorized private key based on the identity-based authorized sub-private keys.Type: ApplicationFiled: January 12, 2016Publication date: August 4, 2016Inventors: Yingfang FU, Shuanlin LIU, Yabin GAO, Xiuzhong CHEN
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Publication number: 20160149700Abstract: A method and apparatus for quantum key distribution comprised of a privacy amplification method and device for the quantum key distribution process as well as a data transmission method and system based on quantum keys is provided, wherein the quantum key distribution method includes the following process: obtaining a bit stream of the same basis vector by sending or receiving coding quantum states of random bit streams and comparing those measurements obtained with the measurement basis vector; in accordance with a preset manner, extracting parameter information associated with privacy amplification and initial key information from the bit stream of the same basis vector after error correction; and using the initial key as an input to implement the privacy amplification algorithm based on the parameter information and thereby obtain shared quantum keys.Type: ApplicationFiled: October 30, 2015Publication date: May 26, 2016Inventors: Yingfang FU, Shuanlin LIU, Yabin GAO, Li XIAO, Junying PANG, Xiuzhong CHEN, Liang FENG