7 results about "Java Card" patented technology

The utility model relates to a novel Java card water meter, and belongs to the technical field of water meter metering. Comprising a water meter base meter, a main control chip, and a power supply control circuit, a pulse sampling circuit, a valve control circuit, an LCD (Liquid Crystal Display) screen, a card reader circuit, a touch control circuit, an alarm circuit and a GPRS (General Packet Radio Service) wireless communication circuit which are connected with the main control chip, the pulse sampling circuit comprises a reed switch arranged below a counter of the water meter; a permanent magnet is installed below a fixed scale gear fixing column in a gear transmission structure of the counter, and when a gear of the scale rotates by one circle, a pulse sampling circuit will generate metering pulses and send the metering pulses to a main control chip. According to the utility model, the Java card reader-writer module is adopted, and a Java card is matched for use.

Methods and devices are provided for installing and hiding applets onto smart cards devices. In a first step, a request for installing an instance of a first applet is received at the card device from an off-card entity. The request includes a first applet identifier. An applet instance is then installed with the first applet identifier in a registry of the card device's operating system. In a further step, a request for hiding the instance of the first applet identified by the first applet identifier is received at the card de-vice from the off-card entity. After receiving the hiding request, the smart card operating system finds the applet instance with the give applet identifier and hides it.

One or more embodiments address the transition to Post Quantum Cryptography (PQC) within secure element hardware environments. The embodiments focus on key management solutions for resource-constrained devices running JAVA CARD or similar platforms. PQC implementations face challenges from large key sizes that strain secure element resources, including RAM, ROM, flash memory, input / output bandwidth, and processing capabilities. The embodiments present methods for handling PQC keys through importation, exportation, generation, storage, utilization, and protection operations. The implementation manifests as an Application Programming Interface (API) that enables applications to leverage key management capabilities efficiently within secure element resource constraints. The API delivers advantages through memory optimization using flexible condensation and derivation mechanisms. Security benefits emerge from integrating key operations within the certified platform environment, enabling hardware acceleration and side-channel attack countermeasures through native code implementation.

One or more embodiments address the transition to Post Quantum Cryptography (PQC) within secure element hardware environments. The embodiments focus on key management solutions for resource-constrained devices running JAVA CARD or similar platforms. PQC implementations face challenges from large key sizes that strain secure element resources, including RAM, ROM, flash memory, input / output bandwidth, and processing capabilities. The embodiments present methods for handling PQC keys through importation, exportation, generation, storage, utilization, and protection operations. The implementation manifests as an Application Programming Interface (API) that enables applications to leverage key management capabilities efficiently within secure element resource constraints. The API delivers advantages through memory optimization using flexible condensation and derivation mechanisms. Security benefits emerge from integrating key operations within the certified platform environment, enabling hardware acceleration and side-channel attack countermeasures through native code implementation.

The invention provides a method for calling a Native function through a JAVA card, a program product, electronic equipment and a storage medium, and the method comprises the steps: receiving a function calling request initiated to a recompiled JAVA operating system through the JAVA card based on a pre-defined unified calling interface, the function calling request being used for calling a target Native function, the recompiled JAVA operating system is integrated with a bridging file generated according to a unified calling interface, the bridging file is mapped to a Native layer, and the recompiled JAVA operating system is pre-linked with one or more Native function libraries; and in response to the function calling request, routing the function calling request to a unified distribution function of a Native layer by the recompiled JAVA operating system through bridging mapping, and calling an operation function in a corresponding Native function library to execute a target Native function. And an efficient request distribution process is realized.

The invention relates to the technical field of intelligent card memory management, and discloses a transient resource allocation method for JavaCard, which comprises the following steps: in response to an application installation loading request, configuring an exclusive DTR space parameter of a loaded application and constructing a corresponding relationship between the loaded application and a logic channel; determining the available monopolized DTR space size of each logic channel based on the corresponding relationship between the loaded application and the logic channel; modifying the memory management API based on the monopolized DTR space parameter of the loaded application and the available monopolized DTR space size of each logic channel to obtain the available transient space size; and carrying out transient resource allocation on the loaded application according to the size of the available transient space. According to the method, on the basis that an original dynamic memory allocation mechanism is not changed, monopolized management of the DTR space can be achieved, and the running reliability of the loaded application is improved. The invention further discloses a transient resource allocation device for the JavaCard, the intelligent card and a system.

The application provides a method, a program product, an electronic device and a storage medium for JAVA card to call a Native function, the method comprising: accepting a function call request initiated by the JAVA card to a recompiled JAVA operating system based on a pre-defined uniform call interface, the function call request being used to call a target Native function, the recompiled JAVA operating system integrating a bridge file generated according to the uniform call interface, the bridge file being mapped to a Native layer, and the recompiled JAVA operating system pre-linking one or more Native function libraries; in response to the function call request, the recompiled JAVA operating system routes the function call request to a uniform distribution function of the Native layer through bridge mapping, and calls an operation function in the corresponding Native function library to execute the target Native function. An efficient request distribution process is implemented.