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4803351 |
IC card system with control of data-writing process
An IC card system comprises an IC card terminal and an IC card which is inserted into the terminal, the terminal including a power-supply circuit for supplying data-writing power to a memory...
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4795893 |
Security device prohibiting the function of an electronic data processing unit after a first cutoff of its electrical power
The invention relates to a security device (1) prohibiting the execution of at least one function of an electronic data processing unit (2) after a first cutoff of its electric power even in the...
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4771460 |
Data processing terminal device which stores a modified decrypted data in a programmable read only memory in order to detect alteration thereof
A data processing terminal device is on-line connected to a host computer and records on journal paper journal data obtained as a result of communication with the host computer. Data is encrypted,...
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4757543 |
Encrypting and decrypting device which stores an algorithm in a memory
A data processing terminal device is on-line connected to a host computer and records on journal paper journal data obtained as a result of communication with the host computer. Data is encrypted,...
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4748557 |
Data processing terminal device for storing encrypted journal data and decrypting the data
A data processing terminal device is on-line connected to a host computer and records on journal paper journal data obtained as a result of communication with the host computer. Data is encrypted,...
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4742351 |
IC card system
An IC card is inserted in an IC card terminal. Under this condition, the PAN data read out from the IC card is compared with the decrypted PAN data for identification purposes. Then, the IC card is...
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4672182 |
Memory card
A memory card has a card medium and a laser memory for storing data. A data processing section for storing encryption and/or decryption key data, an encryption and/or decryption program and a...
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4575621 |
Portable electronic transaction device and system therefor
A portable electronic transaction device and a terminal therefor. The device comprises a central data processor, a fixed memory, an adaptable memory, optical means for transmitting and receiving...
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4499556 |
Security arrangements in data transfer equipment
In equipment which comprises a storage station or portable data carrier holding data and a control station for interaction with the storage station to alter the stored data, for example telephone...
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4409434 |
Transistor integrated device, particularly usable for coding purposes
In a transaction card such as a credit or payment card provided with an integrated circuit for performing and recording the transaction, communications between the card and an access terminal must...
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4211919 |
Portable data carrier including a microprocessor
A portable data or information carrier in the form of a card or the like. In order to maximize the confidentiality of information stored in the carrier, and more specifically to limit the amount of...
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3906460 |
Proximity data transfer system with tamper proof portable data token
A data handling system comprising a data transfer portion and a portable data token portion. The data transfer portion includes means for transferring data between the data token and a computer,...
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