Abstract: In an IC card incorporating an IC chip having a data memory and a CPU for controlling the memory and designed to selectively send/receive data to/from an external apparatus, the first and second format groups of instruction data input from the external apparatus are identified. The identified first and second format groups are selectively processed in accordance with designation information stored in the data memory. The results of the processing are then output with formats corresponding to the first and second format groups.

Abstract: A data memory of an IC card is divided into a plurality of areas, a logic type used when data is written in each area is set, and the logical AND between the written data and stored data in the memory is calculated by an AND logic circuit and written in the memory. In read access, output data can be directly obtained from the memory.

Abstract: An IC card has a CPU and a memory for storing first and second programs. The CPU executes a plurality of instruction in accordance with the first and second programs. The second program is provided by a card manufacturer. A card issuer, such as bank, provides a first program which operates on the second program. The IC card further includes a supervising device for determining when the instructions in the first program address instructions in the second program. When the second program is addressed during operation of the first program, the CPU is interrupted.

Abstract: In an IC card using a file management system for performing data management of a plurality of files obtained by dividing a data memory, when selection is performed to allow use of the file, discrimination ID information representing that each file is already selected is provided to each file. In accessing a file, the provided discrimination ID information is added to each access command to designate a specific access, and a file serving as an access target is recognized on the basis of the designated discrimination ID information, thereby accessing the file.

Abstract: To carry out a non-destructive test for testing insulation of a small-size electric machine having a coil, a surge voltage is applied to the coil of the electric machine mounted in a decompression tank whose inner pressure is kept from 15 to 25 [Torr] so as to generate glow discharge in case there exists a flaw in the coil.

Abstract: In a data transmission system, a card reader/writer provided in a terminal device and an IC card are connected through a contact unit, the IC card is started in response to a signal from the terminal device via the card reader/writer, and transmission/reception of data is subsequently performed. In this data transmission system, the IC card has a CPU for outputting a predetermined answer-to-reset data after the IC card is started and controlling at least two protocols, and a memory for storing protocol type information for determining a protocol to be used from the protocols. The control unit is operated upon starting the IC card, renews the protocol type information in outputting the answer-to-reset data, and returns the renewed protocol type information to an initial one in response to transmission/reception of the data.

Abstract: A file management apparatus capable of inhibiting an accessing operation for a plurality of areas within files. The file management apparatus includes a memory storing files each having multiple areas, a first storage unit for storing lock data denoting a locking condition of an accessing operation for each of the files, a determination device for determining whether the accessing operation for areas to be accessed is inhibited by referring to the lock data for the files, and an accessing device for accessing a particular one of the areas when the determination means determines that access to the group of areas containing that particular area is not inhibited. The file management apparatus also determines the inhibited/non-inhibited status for data areas within each file based on lock data and key data corresponding to each of those data areas.

Abstract: In a file management system for an IC card, which divides a data memory into a plurality of files, and performs data management of the divided files, a directory for managing the files is divided into field length fields, file definition information is stored in each of the divided fields, and information for specifying the file definition information is assigned to each of the divided fields.

Abstract: In an IC card, a memory is divided into a plurality of files and data management of each divided file is performed. The IC card comprises a size allocation section for allocating an optional file size to each file, and a control section for performing a control operation so that size management may be effected according to the size allocated by the size allocation section in which an instruction section for commanding that size management should not be performed in each file is included.

Abstract: According to a portable electronic apparatus processing system of this invention, an IC card sends, to an IC card reader/writer, first timer data included in an answer to reset signal and defining a time after it sends the answer to reset signal to the IC card reader/writer until an instruction is received from the IC card reader/writer. The IC card receives a first instruction from the IC card reader/writer and executes corresponding processing. The IC card also sends second timer data included in the answer to reset signal and defining a time after the processed result is sent to the card reader/writer until the next instruction is received from the card reader/writer. The card reader/writer sets the first timer data in a timer, and sets the second timer data in a memory. The card reader/writer sends the first instruction to the IC card in response to a time out signal from the timer.

Abstract: An IC card has a data memory for storing at least one registration key data and a control element for controlling the data memory and is adapted to receive key data, as collation data, from an outside, collate it with the registration key data stored in the data memory, hold a result of collation in a holding section such as a RAM, and determine whether or not a subsequent access instruction be executed for the data memory. A present system above includes a unit, responsive to instruction data input from the outside, for internally clearing the collation result of the key data. As a result, the collation result of the key data is not held at all times during a power supply. It is thus possible to prevent any unauthorized access to an IC card data by an unauthorized person during the power supply and to structure a flexible system.

Abstract: A cipher communication system for communicating transaction data between a host computer and a portable electronic device, wherein the host computer includes a first memory for storing a master key data, a generator for generating a transaction key data which is used for enciphering the transaction data, a data converter for enciphering the transaction key data according to the transaction key data and a first interface for transferring the transaction key data enciphered by the data converter, and wherein the portable electronic device includes a second interface for receiving the enciphered transaction key data transferred from the host computer, a second memory for storing the master key data, a second data converter for deciphering the enciphered transaction key data received by the second interface and a third memory for storing the transaction key data deciphered by the second data converter, in the manner causing the stored transaction key to be eliminated at a completion of the communication.

Abstract: In a system for serially transmitting data between a card reader/writer and an IC card, when a data string is transmitted from the card reader/writer to the IC card, the data row is divided into a plurality of data strings. Data (control code) representing continuity of data transmission is added to each of the divided data strings. When a data string is transmitted from the IC card to the card reader/writer, the data string is divided into a plurality of data strings. IC card encodes the divided data string, and transmits the encoded data with the data (control code) representing continuity of data transmission is added to the encoded data string. Data transmission between the card reader/writer and the IC card is controlled such that the divided data string and encoded data string are alternately transmitted in units of one.

Abstract: An IC card comprises, a memory including a system area for storing system information, and a user area for storing user information, a CPU for controlling information read/write access of the memory, and a memory for storing program data for determining an operation of the CPU. The CPU stores predetermined data in the user area on the basis of a first command obtained from an external device, and compares the predetermined data with another predetermined data stored in the user area on the basis of a second command obtained from the external device. The CPU detects an abnormality of one of the memory, and data and address lines of the memory according to the result of comparison.

Abstract: A portable electronic device includes a storing unit for storing different types of communication protocols, a priority order setting unit for setting a priority order for the different types of communication protocols stored in the storing unit, a selecting unit for selecting a predetermined communication protocol from the different types of communication protocols on the basis of the priority order set by the priority order setting unit, and a communicating unit for performing communication using the predetermined communication protocol selected by the selecting unit.

Abstract: A portable electronic device which can be connected to an external device comprises a memory, having a storage area of a predetermined storage capacity, for storing information, a CPU for controlling read/write access of information for the memory, a program memory for storing program data for determining an operation of the CPU, and a connector for connecting the CPU to the external device. The CPU has a function of dividing the storage area of the memory into a plurality of first storage areas, a function of dividing a portion of the plurality of first storage areas into a plurality second storage areas, a function of detecting a storage size of each of the plurality of second storage areas, and a function of obtaining an unused storage capacity of the first storage area on the basis of the detected storage sizes of the plurality of second storage areas, and the storage capacity of the memory, and sending back the obtained result to the external device.

Abstract: A mutual certification method includes an IC card having a random number generator, a plurality of key data and a plurality of encryption algorithms, and an IC card terminal which also has a random number generator, a plurality of key data and a plurality of encryption algorithms. The key data and encryption algorithm to be used are designated, and a random number may be transmitted for encryption and return, so that mutual certification may be performed.

Abstract: A mutual authentication system authenticates a first electronic device and a second electronic device by transmitting authentication data between the first and second electronic devices. In this system, the second electronic device transmits a first authentication data to the first electronic device. In the first electronic device, the legitimacy of the second electronic device is determined based on the first authentication data transmitted from the second electronic device. The first electronic device also transmits a second authentication data, which is used for determining the legitimacy of the first electronic device, to the second electronic device. When the second electronic device is not determined to be legitimate by the first electronic device, the first electronic device does not transmit the second authentication data to the second electronic device.

Abstract: In a memory area of a data memory in an IC card, data file definition data for defining a data file is stored from one end of the memory area, and a data file is defined from the other end of the memory area. Area definition data for defining an area in a data file is stored from one end of a data file, and an area is defined from the other end of the data file.

Abstract: When mutual authentication is effected between an IC card and a host device, key data and random number data transmitted from the host device are immediately subjected to the encrypting process without storing the same into a RAM of the IC card, and only authentication data obtained as the result of the encrypting process is stored. As a result, the memory area in the RAM can be saved and effectively used.