Abstract: [Objective] To provide a technique for allowing, in a network communication system consisting of a first server for sending contents to a client and a second server for executing an application upon being called from the client, the first server to appropriately detect that the second server is called. [Solution Means] In a communication method in a network communication system composed of a first server, a second server, and a client, when predetermined contents are sent to the client from the first server, API information for executing an application program of the second server is included in the contents, and the application is executed on the second server by an API call from the client. During this, the second server generates execution certification information on the basis of dynamic common information that changes dynamically, and sends to the client the execution certification information along with the application execution result.

Abstract: [Problem] A fraud detection network system and a fraud detection method are provided which efficiently detect the behavior of malware performing an unauthorized operation, which are easily introduced and which are unlikely to be attacked. [Solution] In a fraud detection network system, a web server device transmits web content information including a call script to a user terminal device, the user terminal device displays the web content and performs the call script. The user terminal device acquires a fraud detection script from a fraud detection server based on the call script, searches detection target data included in the web content information based on the fraud detection script and transmits the result of the search to the fraud detection server device. Then, a predetermined fraud measure operation is performed based on a fraud detection result received from the fraud detection server.

Abstract: [Objective] To provide a technique for allowing, in a network communication system consisting of a first server for sending contents to a client and a second server for executing an application upon being called from the client, the first server to appropriately detect that the second server is called. [Solution Means] In a communication method in a network communication system composed of a first server, a second server, and a client, when predetermined contents are sent to the client from the first server, API information for executing an application program of the second server is included in the contents, and the application is executed on the second server by an API call from the client. During this, the second server generates execution certification information on the basis of dynamic common information that changes dynamically, and sends to the client the execution certification information along with the application execution result.

Abstract: [Problem] A fraud detection network system and a fraud detection method are provided which efficiently detect the behavior of malware performing an unauthorized operation, which are easily introduced and which are unlikely to be attacked. [Solution] In a fraud detection network system, a web server device transmits web content information including a call script to a user terminal device, the user terminal device displays the web content and performs the call script. The user terminal device acquires a fraud detection script from a fraud detection server based on the call script, searches detection target data included in the web content information based on the fraud detection script and transmits the result of the search to the fraud detection server device. Then, a predetermined fraud measure operation is performed based on a fraud detection result received from the fraud detection server.

Abstract: The objective of the present invention is to provide technology for detecting malicious action of an application upon a terminal device using a low load as well as to increase accuracy of detection; in particular, to provide technology capable of performing detection even regarding an application which has been deleted upon the terminal device. A change in the installation state of an application in a terminal device is detected, upon which information for the installed application is reported to a fraud detection server so as to be recorded. In addition, a predetermined feature value based on an application file or component files configuring a package of the application is reported to the fraud detection server. The feature value is associated with the malicious action of the application so as to be registered in an application DB, whereupon if malicious action of the application is detected, fraud detection information is transmitted to the terminal device.

Abstract: The objective of the present invention is to provide technology for detecting malicious action of an application upon a terminal device using a low load as well as to increase accuracy of detection; in particular, to provide technology capable of performing detection even regarding an application which has been deleted upon the terminal device. A change in the installation state of an application in a terminal device is detected, upon which information for the installed application is reported to a fraud detection server so as to be recorded. In addition, a predetermined feature value based on an application file or component files configuring a package of the application is reported to the fraud detection server. The feature value is associated with the malicious action of the application so as to be registered in an application DB, whereupon if malicious action of the application is detected, fraud detection information is transmitted to the terminal device.