Abstract: An information creating device includes processing circuitry configured to identify, for a plurality of applications, one or more files that are accessed due to activation or operation of an application of the plurality of applications during the activation or the operation of the application, identify, for the plurality of applications, one or more other applications that transmit and receive data to and from the application, and store, in a memory, associated file information that indicates, for the plurality of applications, the one or more files accessed during the activation or the operation of the application as associated files of the application, and associated application information that indicates, for the plurality of applications, the one or more other applications that transmit and receive data to and from the application as associated application of the application.

Abstract: An update device includes processing circuitry configured to store package management information that includes associations between files and packages including the files and information indicating existence/non-existence of dependence relationships among the packages, and an access control list that includes associations between the files and access source files permitted to access the files, refer, when a combination of a file and an access source file is specified, to the package management information to identify a package including the file and a package including the access source file, and add, when the identified package including the file and the identified package including the access source file are the same or are mutually in a dependence relationship, the specified combination to the access control list.

Abstract: A verification information creation apparatus acquires an installation directory of software from equipment on which the software is installed, and acquires a file path and a hash value of a file whose hash value is acquirable based on types of files stored in the acquired directory. Then, the verification information creation apparatus creates verification information about the software, where the verification information includes the acquired file path and the hash value of the file.

Abstract: A verification information creation apparatus includes an analysis section configured to acquire a file path and a hash value of a file to be checked using the hash value during verification of the file out of files contained in a software package by executing a predetermined command for the software package; and a verification information creation section configured to create verification information for software in the software package, the verification information including the file path and the hash value of the file, the file path and the hash value being acquired by the analysis section.

Abstract: An update device includes processing circuitry configured to store package management information that includes associations between files and packages including the files and information indicating existence/non-existence of dependence relationships among the packages, and an access control list that includes associations between the files and access source files permitted to access the files, refer, when a combination of a file and an access source file is specified, to the package management information to identify a package including the file and a package including the access source file, and add, when the identified package including the file and the identified package including the access source file are the same or are mutually in a dependence relationship, the specified combination to the access control list.

Abstract: An application operation control device includes processing circuitry configured to store associated file information that indicates, in association with each other, an application and an associated file that is a file whose integrity is to be verified when integrity of the application is determined, and associated application information that indicates, in association with each other, the application and an associated application that is an application that is potentially affected when the integrity of the application is damaged, determine integrity of the associated file of the application, and in a case where, among a plurality of the associated files of the application, integrity of any of the plurality of the associated files is determined to be damaged, extract, as a target application for operation control, an application associated with an associated file the integrity of which is determined to be damaged from the associated file information.

Abstract: An information creating device includes processing circuitry configured to identify, for a plurality of applications, one or more files that are accessed due to activation or operation of an application of the plurality of applications during the activation or the operation of the application, identify, for the plurality of applications, one or more other applications that transmit and receive data to and from the application, and store, in a memory, associated file information that indicates, for the plurality of applications, the one or more files accessed during the activation or the operation of the application as associated files of the application, and associated application information that indicates, for the plurality of applications, the one or more other applications that transmit and receive data to and from the application as associated application of the application.

Abstract: A management system includes processing circuitry configured to acquire, from a device configured to store shared common definition information indicating a definition of a common list serving as a list of files and directories likely to be described in the collation information and a definition of an element attribute serving as conditions for determining elements of a list of files and directories in the collation information in an individual file management device, first common definition information corresponding to identification information of the first common definition information input to the acquisition device, compare the first common definition information acquired with the file managed to distinguish whether there is a file satisfying all the conditions of the first common definition information, and output, to the generation device, second common definition information corresponding to the file managed among the first common definition information acquired based on a distinction result.

Abstract: A protection device includes a memory, and processing circuitry coupled to the memory and configured to acquire a list of file paths of predetermined protection target files, and perform an operation of protecting data of a file corresponding to a file path included in the list.

Abstract: A ring trip detection circuit detects an OFF-hooked state of a telephone receiver during ringing of a telephone set by detecting a change in a voltage across two terminals of a transmission resistor through which a ringing signal is supplied to the telephone set from a ringing signal source.

Abstract: In a ground fault detector for long distance subscriber lines accommodated in a small capacity digital electronic exchange, a DC/DC converter for power supply is stopped during detection of ground fault. Upon reception of the stop signal, the DC/DC converter converts the power supply voltage for the subscribers to a voltage as the system power supply of the exchange, namely to a low voltage before voltage conversion of the DC/DC converter. The battery feed circuit can maintain the alarm condition, even if a current flows continuously to the battery feed resistor due to a ground fault, until the ground fault is recovered by the maintenance person without breaking the resistor.

Abstract: An improved ring trip circuit for a subscriber telephone, for detecting an on-hook state or an off-hook state of the telephone. The ring trip circuit can be formed in a small size and can be formed by a LSI. The ring trip circuit includes a voltage detecting circuit (2), for detecting a voltage difference (.DELTA.V) between both ends of a ringer sending resistor, having a first circuit (S1, S2, A1.about.B3) converting the voltage difference to a current difference, and further having a second circuit (F) converting the current difference to a voltage, the voltage difference varying in response to the on-hook state or the off-hook state of the telephone, and a state detecting circuit (3) for detecting the on-hook state or the off-hook state in response to a value of the voltage from the voltage detecting circuit. The voltage detecting circuit is formed by a plurality of current mirror circuits, each of which includes at least two transistors.

Abstract: A battery feed circuit including a main battery feed part and its peripheral circuits provided in a line circuit of a switching system.

Abstract: An operational amplifier for producing an output signal representing the voltage differential between two input signals is powered by first, second and third power sources respectively having high, intermediate and low output voltage levels. A voltage buffer circuit, which is connected to the second power source, interconnects a constant current source, which is connected to the first power source, and an amplifier means, which is connected to the third power source, and separates the constant current source from the third power source. A differential amplifier in the amplifier means responds to the two input signals for producing a voltage differential output signal, and an output circuit connected between the second and third power sources receives the voltage differential output signal of the differential amplifier for producing the voltage differential output signal of the operational amplifier.

Abstract: A protection circuit for a battery feed circuit used in a switching system. The protection circuit is comprised of: a supervising circuit for detecting an abnormal current flowing through a battery feed resistor; and a voltage limiting circuit for clamping a voltage across the battery feed resistor when the abnormal current is detected. Further, a control circuit is employed for stopping an operational amplifier, which is a component of a conventional battery feed circuit, when the abnormal current is detected.

Abstract: A constant current circuit, including a constant current source which draws a current and a constant current source which sends a current, is connected to a two-wire subscriber line. A ringing signal made up of constant stream of positive and negative current signals is transmitted to the telephone line. The OFF-hook condition of a telephone set is detected by comparing the output voltage of a constant current circuit with a reference voltage for ring trip.