Ciphertext Retrieval Technology Based Homomorphic Encryption

Since the day of the IT industry appears, many information security issues occur. Cryptography is one of powerful means of protecting data security. Therefore, many encryption algorithms are designed and applied to the data storage system. Data security has been greatly improved. However, a large number of ciphertext data brought great retrieval difficulties. Traditional encryption methods can be retrieved after decrypting. This requires us to design an efficiency and accuracy ciphertext retrieval system in the situation of ensuring the safety of the data.VSM model can effectively improve retrieval accuracy, but in order to guarantee the security of the data required by the model, it must be stored in the server in the form of ciphertext, but the ciphertext do not support mixing operation including addition and multiplication of VSM model.In response to these problems, this paper exploded hybrid computing of VSM model using multiplication homomorphic property of RSA algorithm. Ciphertext multiplication be completed in the service side and plaintext addition be completed in the client side. Through the design above, VSM model can be applied in a retrieval system ciphertext. This will not only enhance the security of the cipher text retrieval systems, but also improves the accuracy of retrieval.