Provided here are systems and method for non-intrusive authentication of a user. Such systems and methods may include in an embodiment a waveform generator to generate a message, encrypt the message, and transmit the encrypted message to one or more transmitters. The system may include a decryption engine to receive a bone conduction signal from one or more receivers, process the bone conduction signal, decrypt the processed bone conduction signal, and separate a bone conduction token portion from the decrypted bone conduction signal. The system may include an authentication engine to analyze the bone conduction signal, authenticate a user for the operation detected based on a comparison of the analyzed bone conduction signal and the pilot portion of the message exceeding a preselected threshold, and verify bone conduction signal authenticity via the bone conduction token portion and the token portion.