ENCRYPTION AND DECODING METHOD UTILIZING BOUNDARY CONDITION AND ENCRYPTION AND DECODING DEVICE

摘要

PROBLEM TO BE SOLVED: To provide an encryption decoder and method adopting a common key encryption system where possibility of decoding the encryption. SOLUTION: An encryption transmitter A and an encryption receiver B have secret information such as an equation used for calculation and a method to extract a key in common and the device and method that conducts encryption/decoding is provided by transmitting the boundary condition and an encrypted message.