Abstract: Along with the rapid development of the information society,the information resource is increased day by day.The full-text retrieval technique provides a high-efficient means for searching of information resource,but more problems occur to the information security.With respect to the aforesaid problems,we provided a scheme of the improved homomorphic encryption algorithm,called new homomorphic encryption algorithm,and designed a cipher text retrieval scheme based on NHE algorithm.The scheme uses the properties of homomorphic encryption algorithm in the retrieval process,and the inverted index structure and binary search method is used to search.And it can effectively solve the problem of cipher text retrieval.

Key words: Information security,Cipher text retrieval,Homomorphic encryption