title: A known-plaintext heuristic attack on the Fourier plane encryption algorithm.
abstract: The Fourier plane encryption algorithm is subjected to a known-plaintext attack. The simulated annealing heuristic algorithm is used to estimate the key, using a known plaintext-ciphertext pair, which decrypts the ciphertext with arbitrarily low error. The strength of the algorithm is tested by using this estimated key to decrypt a different ciphertext which was also encrypted using the same original key. We assume that the plaintext is amplitude-encoded real-valued image, and analyze only the mathematical algorithm rather than a real optical system that can be more secure. The Fourier plane encryption algorithm is found to be susceptible to a known-plaintext heuristic attack.
authors.forename: Unnikrishnan
authors.initials: U
authors.lastname: Gopinathan
authors.forename: David S
authors.initials: DS
authors.lastname: Monaghan
authors.forename: Thomas J
authors.initials: TJ
authors.lastname: Naughton
authors.forename: John T
authors.initials: JT
authors.lastname: Sheridan