Processing system comprised of data processing device and data access device each converting data and mutually communicating the converted data

A data processing device for use in a processing system comprising the data processing device and a data access device interconnected to implement a predetermined function, said data access device including a data access device reception unit configured to receive outputs from said data processing unit;

• a first data access device conversion unit connected to said data access device reception unit to convert an output from said data access device reception unit in accordance with a predetermined method;
• a data access device comparator unit connected to said data access device reception unit and said first data access device conversion unit to compare an output from said first data access device conversion unit and data defined by the output from said data access device reception unit;
• a second data access device conversion unit connected to said data access device reception unit to convert the output from said data access device reception unit in accordance with a predetermined method;
• and a data access device operation determining unit for determining an operation of said data access device based on a comparison result of said data access device comparator and for controlling transmitting an output from said second data access device conversion unit to said data processing device;
• said data processing device including:
• a data select unit disposed to select data;
• a first conversion unit connected to said data select unit to convert said selected data in accordance with a predetermined method;
• a transmission unit connected to said first conversion unit to transmit said selected data and said converted data generated by said first conversion unit to said data access device reception unit;
• a reception unit receiving data from said second data access device conversion unit;
• a second conversion unit connected to said data select unit to convert said selected data in accordance with a predetermined method;
• and
• an operation determining unit connected to said reception unit and said second conversion unit to compare outputs from said reception unit and said second conversion unit, and, based on a result of comparing the outputs from said reception unit and said second conversion unit, determining an operation of said data processing device.

A data access device used in a processing system comprising a data processing device and a data access interconnected to implement a predetermined function, said data processing device including a data select unit disposed to select data, a first conversion unit connected to said data select unit to convert said selected data in accordance with a predetermined method, a first transmission unit connected to said first conversion unit to transmit said selected data and said converted data generated by said first conversion unit to said data access device, a first reception unit receiving data from said data access device, a second conversion unit connected to said data select unit to convert said selected data in accordance with a predetermined method, and a first operation determining unit connected to said first reception unit and said second conversion unit to compare outputs from said first reception unit and said second conversion unit and respond to a result of comparing the outputs from said first reception unit and said second conversion unit by determining an operation of said data processing device, said data access device being interconnected to said data processing device to implement a predetermined function, said data access device including:

• a second reception unit connected to said first transmission unit to receive an output from said first transmission unit;
• a third conversion unit connected to said second reception unit to convert an output from said second reception unit in accordance with a predetermined method;
• a first comparator unit connected to said second reception unit and said third conversion unit to compare an output from said third conversion unit and data defined by the output from said second reception unit;
• a fourth conversion unit connected to said second reception unit to convert the output from said second reception unit in accordance with a predetermined method;
• and
• a second operation determining unit connected to said first comparator unit and said fourth conversion unit to respond to a result of the comparison by determining an operation of said data access device and transmitting an output from said fourth conversion unit to said data processing device.

A method for verifying communication between a first device and a second device, wherein a first function and second function are known to both of the devices, the method comprising the machine-implemented steps of:

• generating a random number;
• generating a first function value based on the random number and the first function known to the first device;
• transmitting the random number and the first function value to the second device;
• generating a second function value based on the random number and the second function known to the first device;
• receiving a third function value from the second device;
• comparing the second function value and the third function value;
• and
• validating communications between the first device and the second device based on a result of the comparing step;
• the second device generating the third function value in the computer-implemented steps of:
• generating a fourth function value based on the received random number and the first function known to the second device;
• comparing the fourth function value with the received first function value;
• generating the third function value based on the received random number and the second function known to the second device;
• and
• transmitting the third function value to the first device.