METHODS AND APPARATUSES FOR CIPHER INDEXING IN ORDER TO EFFECTIVE SEARCH OF CIPHERED-DATABASE

摘要

An encryption method and the data processing method of a client are provided to process encrypted data according to cryptography, thereby protecting safely data. By encrypting a plaintext group, a ciphertext group is produced(S11). The ciphertext group is divided into a first group and a second group(S12). The ciphertext group is stored in a database after exchanging the location of the first group and the location of the second group(S13,S14). When the ciphertext group is produced, cryptography having a sequence maintenance function is used.