ENCRYPTION DEVICE ENCRYPTED TEXT CONVERSION DEVICE ENCRYPTION PROGRAM ENCRYPTED TEXT CONVERSION PROGRAM ENCRYPTION METHOD AND ENCRYPTED TEXT CONVERSION METHOD

摘要

This encryption device (500) is provided with an encryption unit (504) a detection element generation unit (505) and a transmission unit (506). The encryption unit (504) encrypts plain text using one of two keys which form a pair to generate an encrypted text in which the plain text is encrypted and which is capable of being homomorphically calculated. The detection element generation unit (505) uses the one key and the encrypted text to generate a detection element E used to detect alterations of the encrypted text. The transmission unit (506) transmits the encrypted text and the detection element.