Patents by Inventor Chang-Fung Yang

Chang-Fung Yang 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).

  • Patent number: 11954203
    Abstract: Methods and devices for determining whether a mobile device has been compromised. The mobile device has a managed portion of memory and an unmanaged portion of memory, a managed profile and an unmanaged profile, and the managed profile includes files stored in the managed portion of memory and the unmanaged profile includes files stored in the unmanaged portion of memory. The managed profile is governed by a device policy set by a remote administrator. File tree structure information for the unmanaged profile of the mobile device is obtained that details at least a portion of a tree-based structure of folders and files in the unmanaged portion of memory. It is determined from the file tree structure information that the mobile device has been compromised and, based on that determination, an action is taken.
    Type: Grant
    Filed: February 1, 2023
    Date of Patent: April 9, 2024
    Assignee: BlackBerry Limited
    Inventors: Chang Fung Yang, Robert Joseph Lombardi, Chi Hing Ng, Johnathan George White
  • Publication number: 20240015186
    Abstract: A method of establishing a secure communication channel between a first communication device and a second communication device. The secure communication channel is defined by one or more algorithm options and the one or more algorithm options are associated with one of one or more option categories. The method includes receiving a signal representing one or more selections. The method further includes, for the respective option categories, generating a sorted list of algorithm options based on the received selections and generating a security association proposal including one or more of the algorithm options from the respective sorted lists of algorithm options. The security association proposal is generated based on an order in the sorted list of algorithm options. The method further includes transmitting the security association proposal to the second communication device for establishing the secure communication channel.
    Type: Application
    Filed: July 12, 2023
    Publication date: January 11, 2024
    Applicant: MALIKIE INNOVATIONS LIMITED
    Inventors: Chang Fung YANG, Jason Songbo XU
  • Patent number: 11743300
    Abstract: A method of establishing a secure communication channel between a first communication device and a second communication device. The secure communication channel is defined by one or more algorithm options and the one or more algorithm options are associated with one of one or more option categories. The method includes receiving a signal representing one or more selections. The method further includes, for the respective option categories, generating a sorted list of algorithm options based on the received selections and generating a security association proposal including one or more of the algorithm options from the respective sorted lists of algorithm options. The security association proposal is generated based on an order in the sorted list of algorithm options. The method further includes transmitting the security association proposal to the second communication device for establishing the secure communication channel.
    Type: Grant
    Filed: October 14, 2021
    Date of Patent: August 29, 2023
    Assignee: BlackBerry Limited
    Inventors: Chang Fung Yang, Jason Songbo Xu
  • Publication number: 20230224307
    Abstract: Methods and devices for determining whether a mobile device has been compromised. File tree structure information for the mobile device is obtained that details at least a portion of a tree-based structure of folders and files in a portion of memory. The file tree structure information is analyzed to determine that the mobile device has been compromised, has not been compromised, or might be compromised. Based on determining that the mobile device might be compromised, the mobile device is instructed to execute a restricted action. If the restricted action occurs on the mobile device then it is determined that the mobile device has been compromised. Based on that determination, an action is taken.
    Type: Application
    Filed: March 14, 2023
    Publication date: July 13, 2023
    Applicant: BlackBerry Limited
    Inventors: Chang Fung YANG, Robert Joseph LOMBARDI, Chi Hing NG, Johnathan George WHITE
  • Publication number: 20230185914
    Abstract: Methods and devices for determining whether a mobile device has been compromised. The mobile device has a managed portion of memory and an unmanaged portion of memory, a managed profile and an unmanaged profile, and the managed profile includes files stored in the managed portion of memory and the unmanaged profile includes files stored in the unmanaged portion of memory. The managed profile is governed by a device policy set by a remote administrator. File tree structure information for the unmanaged profile of the mobile device is obtained that details at least a portion of a tree-based structure of folders and files in the unmanaged portion of memory. It is determined from the file tree structure information that the mobile device has been compromised and, based on that determination, an action is taken.
    Type: Application
    Filed: February 1, 2023
    Publication date: June 15, 2023
    Applicant: BlackBerry Limited
    Inventors: Chang Fung YANG, Robert Joseph LOMBARDI, Chi Hing NG, Johnathan George WHITE
  • Patent number: 11645402
    Abstract: Methods and devices for determining whether a computing device has been compromised. File tree structure information for the computing device is obtained that details at least a portion of a tree-based structure of folders and files in a memory on the computing device. It is then determined from the file tree structure information that the computing device is compromised and, based on the determination that the computing device has been compromised, an action is taken.
    Type: Grant
    Filed: August 15, 2019
    Date of Patent: May 9, 2023
    Assignee: BlackBerry Limited
    Inventors: Chang Fung Yang, Chi Hing Ng, Robert Joseph Lombardi, Johnathan George White
  • Patent number: 11632377
    Abstract: Methods and devices for determining whether a mobile device has been compromised. File tree structure information for the mobile device is obtained that details at least a portion of a tree-based structure of folders and files in a portion of memory. The file tree structure information is analyzed to determine that the mobile device has been compromised, has not been compromised, or might be compromised. Based on determining that the mobile device might be compromised, the mobile device is instructed to execute a restricted action. If the restricted action occurs on the mobile device then it is determined that the mobile device has been compromised. Based on that determination, an action is taken.
    Type: Grant
    Filed: August 15, 2019
    Date of Patent: April 18, 2023
    Assignee: BlackBerry Limited
    Inventors: Chang Fung Yang, Robert Joseph Lombardi, Chi Hing Ng, Johnathan George White
  • Patent number: 11599639
    Abstract: Methods and devices for determining whether a mobile device has been compromised. The mobile device has a managed portion of memory and an unmanaged portion of memory, a managed profile and an unmanaged profile, and the managed profile includes files stored in the managed portion of memory and the unmanaged profile includes files stored in the unmanaged portion of memory. The managed profile is governed by a device policy set by a remote administrator. File tree structure information for the unmanaged profile of the mobile device is obtained that details at least a portion of a tree-based structure of folders and files in the unmanaged portion of memory. It is determined from the file tree structure information that the mobile device has been compromised and, based on that determination, an action is taken.
    Type: Grant
    Filed: August 15, 2019
    Date of Patent: March 7, 2023
    Assignee: BlackBerry Limited
    Inventors: Chang Fung Yang, Robert Joseph Lombardi, Chi Hing Ng, Johnathan George White
  • Patent number: 11343258
    Abstract: Methods and devices for determining whether a mobile device has been compromised. The mobile device has a managed portion of memory and an unmanaged portion of memory, a managed profile and an unmanaged profile, and the managed profile includes files stored in the managed portion of memory and the unmanaged profile includes files stored in the unmanaged portion of memory. The managed profile is governed by a device policy set by a remote administrator. File tree structure information for the managed profile of the mobile device is obtained that details at least a portion of a tree-based structure of folders and files in the managed portion of memory. It is determined from the file tree structure information that the mobile device has been compromised and, based on that determination, an action is taken.
    Type: Grant
    Filed: August 15, 2019
    Date of Patent: May 24, 2022
    Assignee: BlackBerry Limited
    Inventors: Chang Fung Yang, Robert Joseph Lombardi, Chi Hing Ng, Johnathan George White
  • Publication number: 20220038508
    Abstract: A method of establishing a secure communication channel between a first communication device and a second communication device. The secure communication channel is defined by one or more algorithm options and the one or more algorithm options are associated with one of one or more option categories. The method includes receiving a signal representing one or more selections. The method further includes, for the respective option categories, generating a sorted list of algorithm options based on the received selections and generating a security association proposal including one or more of the algorithm options from the respective sorted lists of algorithm options. The security association proposal is generated based on an order in the sorted list of algorithm options. The method further includes transmitting the security association proposal to the second communication device for establishing the secure communication channel.
    Type: Application
    Filed: October 14, 2021
    Publication date: February 3, 2022
    Applicant: BlackBerry Limited
    Inventors: Chang Fung YANG, Jason Songbo XU
  • Patent number: 11178190
    Abstract: A method of establishing a secure communication channel between a first communication device and a second communication device. The secure communication channel is defined by one or more algorithm options and the one or more algorithm options are associated with one of one or more option categories. The method includes receiving a signal representing one or more selections. The method further includes, for the respective option categories, generating a sorted list of algorithm options based on the received selections and generating a security association proposal including one or more of the algorithm options from the respective sorted lists of algorithm options. The security association proposal is generated based on an order in the sorted list of algorithm options. The method further includes transmitting the security association proposal to the second communication device for establishing the secure communication channel.
    Type: Grant
    Filed: November 6, 2018
    Date of Patent: November 16, 2021
    Assignee: BlackBerry Limited
    Inventors: Chang Fung Yang, Jason Songbo Xu
  • Publication number: 20210051158
    Abstract: Methods and devices for determining whether a mobile device has been compromised. File tree structure information for the mobile device is obtained that details at least a portion of a tree-based structure of folders and files in a portion of memory. The file tree structure information is analyzed to determine that the mobile device has been compromised, has not been compromised, or might be compromised. Based on determining that the mobile device might be compromised, the mobile device is instructed to execute a restricted action. If the restricted action occurs on the mobile device then it is determined that the mobile device has been compromised. Based on that determination, an action is taken.
    Type: Application
    Filed: August 15, 2019
    Publication date: February 18, 2021
    Applicant: BlackBerry Limited
    Inventors: Chang Fung YANG, Robert Joseph LOMBARDI, Chi Hing NG, Johnathan George WHITE
  • Publication number: 20210049287
    Abstract: Methods and devices for determining whether a computing device has been compromised. File tree structure information for the computing device is obtained that details at least a portion of a tree-based structure of folders and files in a memory on the computing device. It is then determined from the file tree structure information that the computing device is compromised and, based on the determination that the computing device has been compromised, an action is taken.
    Type: Application
    Filed: August 15, 2019
    Publication date: February 18, 2021
    Applicant: BlackBerry Limited
    Inventors: Chang Fung YANG, Chi Hing NG, Robert Joseph LOMBARDI, Johnathan George WHITE
  • Publication number: 20210049273
    Abstract: Methods and devices for determining whether a mobile device has been compromised. The mobile device has a managed portion of memory and an unmanaged portion of memory, a managed profile and an unmanaged profile, and the managed profile includes files stored in the managed portion of memory and the unmanaged profile includes files stored in the unmanaged portion of memory. The managed profile is governed by a device policy set by a remote administrator. File tree structure information for the unmanaged profile of the mobile device is obtained that details at least a portion of a tree-based structure of folders and files in the unmanaged portion of memory. It is determined from the file tree structure information that the mobile device has been compromised and, based on that determination, an action is taken.
    Type: Application
    Filed: August 15, 2019
    Publication date: February 18, 2021
    Applicant: BlackBerry Limited
    Inventors: Chang Fung YANG, Robert Joseph LOMBARDI, Chi Hing NG, Johnathan George WHITE
  • Publication number: 20210051156
    Abstract: Methods and devices for determining whether a mobile device has been compromised. The mobile device has a managed portion of memory and an unmanaged portion of memory, a managed profile and an unmanaged profile, and the managed profile includes files stored in the managed portion of memory and the unmanaged profile includes files stored in the unmanaged portion of memory. The managed profile is governed by a device policy set by a remote administrator. File tree structure information for the managed profile of the mobile device is obtained that details at least a portion of a tree-based structure of folders and files in the managed portion of memory.
    Type: Application
    Filed: August 15, 2019
    Publication date: February 18, 2021
    Applicant: BlackBerry Limited
    Inventors: Chang Fung YANG, Robert Joseph LOMBARDI, Chi Hing NG, Johnathan George WHITE
  • Publication number: 20200145464
    Abstract: A method of establishing a secure communication channel between a first communication device and a second communication device. The secure communication channel is defined by one or more algorithm options and the one or more algorithm options are associated with one of one or more option categories. The method includes receiving a signal representing one or more selections. The method further includes, for the respective option categories, generating a sorted list of algorithm options based on the received selections and generating a security association proposal including one or more of the algorithm options from the respective sorted lists of algorithm options. The security association proposal is generated based on an order in the sorted list of algorithm options. The method further includes transmitting the security association proposal to the second communication device for establishing the secure communication channel.
    Type: Application
    Filed: November 6, 2018
    Publication date: May 7, 2020
    Applicant: BlackBerry Limited
    Inventors: Chang Fung YANG, Jason Songbo XU
  • Patent number: 10270603
    Abstract: Systems, methods, and software can be used to process certificate validation warnings. In some aspect, a connection to a Virtual Private Network (VPN) server is initiated at an electronic device. The VPN server is associated with a VPN profile. In response to initiating the connection, a certificate associated with the VPN server is received at the electronic device. A validation warning associated with the certificate is received. A fingerprint of the certificate is generated. A validation action is selected based on the validation warning, the fingerprint, and the VPN profile. The selected validation action is executed.
    Type: Grant
    Filed: March 17, 2016
    Date of Patent: April 23, 2019
    Assignee: BlackBerry Limited
    Inventors: Chang Fung Yang, Robert Marcel Dugal, Jason Songbo Xu
  • Patent number: 10149166
    Abstract: Systems, methods, and software can be used to verify a certificate. In some aspects, a request to connect to a Virtual Private Network (VPN) server is received from an application on a mobile device. A certificate of the VPN server is obtained at the mobile device. A device-level certificate verification for the certificate is performed. Whether an application-level certificate verification is provisioned for the application is determined. In response to determining that the application-level certification verification is provisioned, the application-level certificate verification for the certificate is performed. In response to verifying that the certificate passes the application-level certificate verification, the mobile device is connected to the VPN server.
    Type: Grant
    Filed: January 14, 2016
    Date of Patent: December 4, 2018
    Assignee: BlackBerry Limited
    Inventors: Elliott Michael Guy Mazzuca, Chang Fung Yang, Jason Songbo Xu, Chi Chiu Tse
  • Publication number: 20170272256
    Abstract: Systems, methods, and software can be used to process certificate validation warnings. In some aspect, a connection to a Virtual Private Network (VPN) server is initiated at an electronic device. The VPN server is associated with a VPN profile. In response to initiating the connection, a certificate associated with the VPN server is received at the electronic device. A validation warning associated with the certificate is received. A fingerprint of the certificate is generated. A validation action is selected based on the validation warning, the fingerprint, and the VPN profile. The selected validation action is executed.
    Type: Application
    Filed: March 17, 2016
    Publication date: September 21, 2017
    Applicant: BlackBerry Limited
    Inventors: Chang Fung YANG, Robert Marcel DUGAL, Jason Songbo XU
  • Publication number: 20170208469
    Abstract: Systems, methods, and software can be used to verify a certificate. In some aspects, a request to connect to a Virtual Private Network (VPN) server is received from an application on a mobile device. A certificate of the VPN server is obtained at the mobile device. A device-level certificate verification for the certificate is performed. Whether an application-level certificate verification is provisioned for the application is determined. In response to determining that the application-level certification verification is provisioned, the application-level certificate verification for the certificate is performed. In response to verifying that the certificate passes the application-level certificate verification, the mobile device is connected to the VPN server.
    Type: Application
    Filed: January 14, 2016
    Publication date: July 20, 2017
    Applicant: BlackBerry Limited
    Inventors: Elliott Michael Guy MAZZUCA, Chang Fung YANG, Jason Songbo XU, Chi Chiu TSE