Method for data encryption and method for conjunctive keyword search of encrypted data

The invention data as encrypted to a method and combination of the encrypted data keyword search method, a to encrypt the user's critical data, and then stored on the server for the data storage, the encrypted data is stored using a combination keyword to the server for data storage It relates to a method of searching. According to the present invention, a method of retrieving the data you need without having to decrypt the encrypted data, the server which by the user remains unaware of the contents and keyword data provide the required data, to ensure the privacy of sensitive data of users there is an advantage. Further, by shortening the operation time when the encrypted data search, there is an advantage that can be prevented due to an excessive amount of computation is based on an existing method of pairing operations with which efficiency is decreased. Encrypted data, combined keyword search, index, trap doors, field Keywords