Abstract: There is provided a method of generating a Keccak message authentication code (KMAC) based on white-box implementation, using at least one processor. The method includes: obtaining a white-box implementation of a round function of a KMAC algorithm; receiving an input message; obtaining a plurality of message blocks based on the input message; and for each of the plurality of message blocks at a plurality of iterations, respectively: modifying a current state of the KMAC algorithm based on the message block to produce a modified current state of the KMAC algorithm; inputting the modified current state to a state transformation function including the white-box implementation of the round function; and executing the white-box implementation of the round function based on the modified current state to obtain an updated state of the KMAC algorithm as an output of the state transformation function.