Information leakage prevention apparatus and information leakage prevention method

An information leakage prevention apparatus comprising:

• a clock signal extractor connected to an interface of an information equipment for processing an information signal, to extract a clock signal component from the information signal;
• a clock signal generator to generate a pseudo clock signal having a specified phase difference relative to the clock signal component extracted by the clock signal extractor;
• a prevention signal generator to generate an nth-order differential signal of the pseudo clock signal, wherein integer n≧2, as a leakage prevention signal only according to the pseudo clock signal generated by the clock signal generator;
• an input/output unit to detect electromagnetic waves caused by the information signal and output the leakage prevention signal generated by the prevention signal generator;
• and
• a strength measuring unit to measure a strength of the electromagnetic waves detected by the input/output unit,
• the prevention signal generator generating the leakage prevention signal according to the electromagnetic wave strength measured by the strength measuring unit so that electromagnetic waves leaking from the information signal are not received and decoded at a remote location.

An information leakage prevention method comprising:

• configuring at least one processor or circuitry to perform the steps of:
• extracting a clock signal component from an information signal processed by an information equipment;
• generating a pseudo clock signal having a specified phase difference relative to the extracted clock signal component;
• generating, based only on the generated pseudo clock signal, an nth-order differential signal of the pseudo clock signal, wherein integer n≧2, as a leakage prevention signal having an electromagnetic wave strength stronger than electromagnetic waves leaking from the information signal;
• and
• outputting the generated leakage prevention signal so that the leaked electromagnetic waves are not received and decoded at a remote location.

An information leakage prevention apparatus comprising:

• a clock signal extractor connected to an interface of an information equipment for processing an information signal, to extract a clock signal component from the information signal;
• a clock signal generator to generate a pseudo clock signal having a specified phase difference relative to the clock signal component extracted by the clock signal extractor;
• a prevention signal generator to generate, based only on the pseudo clock signal generated by the clock signal generator, an N-times periodic signal of the pseudo clock signal, wherein integer N≧2, as a leakage prevention signal having an electromagnetic wave strength stronger than electromagnetic waves leaking from the information signal;
• and
• a prevention signal output unit to output the leakage prevention signal generated by the prevention signal generator so that the leaked electromagnetic waves are not received and decoded at a remote location.

An information leakage prevention apparatus comprising:

• a clock signal extractor connected to an interface of an information equipment for processing an information signal, to extract a clock signal component from the information signal;
• a clock signal generator to generate a pseudo clock signal having a specified phase difference relative to the clock signal component extracted by the clock signal extractor;
• a prevention signal generator to generate an N-times periodic signal of the pseudo clock signal, wherein integer N≧2, as a leakage prevention signal only according to the pseudo clock signal generated by the clock signal generator;
• an input/output unit to detect electromagnetic waves caused by the information signal and output the leakage prevention signal generated by the prevention signal generator;
• and
• a strength measuring unit to measure a strength of the electromagnetic waves detected by the input/output unit,
• the prevention signal generator generating the leakage prevention signal according to the electromagnetic wave strength measured by the strength measuring unit so that electromagnetic waves leaking from the information signal are not received and decoded at a remote location.

An information leakage prevention apparatus comprising:

• a clock signal extractor connected to an interface of an information equipment for processing an information signal, to extract a clock signal component from the information signal;
• a clock signal generator to generate a pseudo clock signal having a specified phase difference relative to the clock signal component extracted by the clock signal extractor;
• a prevention signal generator to generate, based only on the pseudo clock signal generated by the clock signal generator, a signal obtained by reducing a duty ratio of the pseudo clock signal as a leakage prevention signal having an electromagnetic wave strength stronger than electromagnetic waves leaking from the information signal;
• and
• a prevention signal output unit to output the leakage prevention signal generated by the prevention signal generator so that the leaked electromagnetic waves are not received and decoded at a remote location.

An information leakage prevention apparatus comprising:

• a clock signal extractor connected to an interface of an information equipment for processing an information signal, to extract a clock signal component from the information signal;
• a clock signal generator to generate a pseudo clock signal having a specified phase difference relative to the clock signal component extracted by the clock signal extractor;
• a prevention signal generator to generate a signal obtained by reducing a duty ratio of the pseudo clock signal as a leakage prevention signal only according to the pseudo clock signal generated by the clock signal generator;
• an input/output unit to detect electromagnetic waves caused by the information signal and output the leakage prevention signal generated by the prevention signal generator;
• and
• a strength measuring unit to measure a strength of the electromagnetic waves detected by the input/output unit,
• the prevention signal generator generating the leakage prevention signal according to the electromagnetic wave strength measured by the strength measured by the strength measuring unit so that electromagnetic waves leaking from the information signal are not received and decoded at a remote location.