a holographic device and method encrypts a time dependent data signal , s , by a complex time dependent phase shifting signal . this produces a new signal whose modulus is equal the absolute value of the data signal , s , but has widely spread the frequency of the data signal . this new complex signal is mathematically transformed , producing an amplitude and phase spectrum of signal components . the amplitude and phase signals are modulated into a radio frequency carrier as quadrature components and transmitted . at the receiver , the quadrature signals are separated into an amplitude and phase components which are then mathematically inverse transformed . the result is a complex signal with a real and imaginary components . the resulting signal is an accurate representation of the original data signal if a complete signal is recovered . if only a portion of the frequencies transmitted are recovered , the modulus is still represents the data signal , but may have artifacts frequencies in the signal . the modulus may then be filtered to remove these artifact frequencies , recovering the reconstructed data signal .