Importance

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Abstract

A data processing system which protects the secrecy of confidential inforion includes a data processing machine with which an operator may carry on a confidential dialogue through a data transmitting device such as a keyboard and an auxiliary device in which is stored a predetermined permanent code key which controls access to the machine upon comparison to and recognition of a confidential code personal to the user. The auxiliary device may take the form of a card having an electronic integrated circuit means thereon and a plurality of contact members which are respectively connected to the circuit means by integrated connections. The contact members are designed to generate in response to external contact by a user operated stylus, a set of basic items of information corresponding to the confidential code personal to the user. The user code is compared to the permanent code key and a signal is generated which permits the dialogue between the machine and data transmitting device to take place if the coded data inputted by the user corresponds to the permanently stored code key. To this end, the circuit means includes at least a memory for storing the permanent code, an encoder connected to the contact members and a comparator connected to compare the permanent code key and inputted coded data.

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First Claim