ENCRYPTION DEVICE, DECRYPTION DEVICE, ENCRYPTION SYSTEM, ENCRYPTION METHOD AND PROGRAM

PROBLEM TO BE SOLVED: To provide an encryption device which encrypts using a plurality of conditions without need to add a one-time signature and a label, and a decryption device.SOLUTION: An encryption device of the present invention comprises a random number generation part, a random number coupling part, a secret dispersion part, a hash part and an encryption part. The hash part finds a hash value hcorresponding to each segment data Susing a hash function H. The encryption part uses the hash value hto encrypt the segment data Sand generates a segmented cryptograph C. The decryption device of the invention comprises at least a decryption part, an acquisition part, a confirmation part and a restoration part.