Patent ID: 8150033

Claim:
A method of encrypting a first set of data, the method comprising: encoding the set of data with a first encryption key; transforming the set of data encoded with the first encryption key; with a second encryption key, encoding the transformation of the set of data encoded with the first encryption key; transforming the encoded transformation of the set of data encoded with the first encryption key generating thereby an encrypted set of data; recording the encrypted set of data as a digital hologram in digital storage; wherein the first encryption key is an input random phase mask; wherein the second encryption key is a Fourier phase mask; and wherein the digital hologram is described by the equation: I E (ξ, η)=|[ F (ξ, η) A (ξ, η)] H (ξ, η)| 2 +|R (ξ, η)| 2 +{[F (ξ, η) A (ξ, η)] H (ξ, η)} R (ξ, η)* +{[ F (ξ, η) A (ξ, η)] H (ξ, η)}* R (ξ, η) wherein F(ξ, η) is the Fourier transform of the first set of data, A(ξ, η) is the Fourier transform of the first encryption key, H(ξ, η) is the second encryption key, R(ξ, η) is a reference wave used to record the digital hologram, and denotes a convolution operation.