Abstract: It is an object of the present invention to provide encryption and decryption apparatuses capable of selecting a part of file portions handled on a computer, and encrypting and decrypting only the thus selected part of file portions. The encryption apparatus 200 and the decryption apparatus 300 can encrypt and decrypt all of item data elements in item data portions in specified association with a specific item name portion of the database 400 while maintaining reciprocal relationships among the item data portions in the database 400 regardless of whether item data elements in the item data portions are encrypted or not. This leads to the fact that major features of the database such as data search and data alignment functions remain enabled even if item data elements in item data portions of the database are encrypted.

Abstract: Herein disclosed is an information processing apparatus for processing a plurality of entry information elements transmitted from at least one terminal, comprising: period setting means for setting an output operation period after specifying an output start time and an output end time collectively defining the output operation period; time keeping means for keeping time including the output start time specified by the period setting means and the output end time specified by the period setting means; information receiving means for receiving the entry information elements transmitted from the terminal; information encrypting means for encrypting the entry information elements received from the information receiving means before producing encrypted entry information elements; information storing means for storing the encrypted entry information elements produced by the information encrypting means; and information decrypting means for decrypting the encrypted entry information elements stored in the informatio

Abstract: It is an object of the present invention to provide encryption and decryption apparatuses capable of selecting a part of file portions handled on a computer, and encrypting and decrypting only the thus selected part of file portions. The encryption apparatus 200 and the decryption apparatus 300 can encrypt and decrypt all of item data elements in item data portions in specified association with a specific item name portion of the database 400 while maintaining reciprocal relationships among the item data portions in the database 400 regardless of whether item data elements in the item data portions are encrypted or not. This leads to the fact that major features of the database such as data search and data alignment functions remain enabled even if item data elements in item data portions of the database are encrypted.