Random code generator, fabricating method thereof and device applying the same

A method for fabricating a random code generator, comprising:

• providing at least one resistive switch element;
• providing a control circuit electrically connected to the at least one resistive switch element for:
• performing a forming step on the at least one resistive switch element;
• performing a writing step on the at least one resistive switch element with a preset voltage;
• and
• performing two resistance reading steps on the at least one resistive switch element to obtain a first read data and a second read data respectively;
• and
• providing a logic circuit for performing a logic operation to compare the first read data with the second read data, thereby generating a random code.

A physically unclonable function (PUF) device, comprising:

• a random code generator, comprising:
• at least one resistive switch element,
• a control circuit, electrically connected to the at least one resistive switch and used for:
• performing a forming step on the at least one resistive switch element;
• performing a writing step on the at least one resistive switch element with a preset voltage;
• and
• performing two resistance reading steps on the at least one resistive switch element to obtain a first read data and a second read data respectively;
• and
• a logic circuit, electrically connected to the control circuit and used for performing a logic operation to compare the first read data with the second read data, thereby generating a random code.