METHOD, DEVICE, PROGRAM, AND SYSTEM FOR ENCRYPTION

摘要

PROBLEM TO BE SOLVED: To increase the safety when object data are embedded in a container text and encrypted.

SOLUTION: A preprocessing means 152 of an encryption means 150 of a server 100 performs preprocessing for converting object data into a byte progression, and a key generating means 154 generates a key consisting of information showing the contents of the preprocessing carried out by the processing means 152. A container text converting means 156 converts the container text on the basis of a synonym dictionary stored in a second storage means 180 so that the contents of the container text having been converted are a synonym for the contents of the unconverted container text and the number of characters of the container text having been converted between adjacent punctuation marks is equal to the number of bytes of each component of the byte progression obtained by the preprocessing means 152.

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