A data transmission method using an adaptive secret key based on PPUF is a method in which a transmitter uses a delay characteristic of a PPUF (Public Physically Unclonable Function) to generate a first challenge value and a response that is output at a reference time after the first challenge value is input Determining a response set including a first challenge set including a plurality of first challenge values and a plurality of responses, determining whether the response includes the reference time and the information including the response set And transmitting encrypted data using a secret key generated using the plurality of first challenge values, the method comprising: receiving, by the receiver, the information, and for each of the response values included in the response set, In the PPUF circuit having the characteristics, the respective response values are outputted at the reference time from the inputting of the challenge value Determining a second challenge set including a plurality of second challenge values by repeating the process of determining a specific second challenge value, and determining the second challenge set using the secret key generated using the plurality of second challenge values And decrypting the encrypted data.
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