The invention discloses a
ciphertext cloud-storage oriented
document retrieval method and a
ciphertext cloud-storage oriented
document retrieval system, belonging to the technical field of
information security. The method comprises the following steps: 1) a
client generates an index key for a user by a
master key imported by the user, and encrypts the index key by the
master key, then stores the index key into a
server; 2) after receiving the attribute metainformation of a document to be inquired input by a certain user, the
client acquires a
ciphertext of the index key from the
server, then decrypts the ciphertext so as to obtain a decrypted index key; 3) the
client encrypts the attribute metainformation of the document to be inquired by the decrypted index key, then sends the encrypted attribute metainformation to the
server; and 4) the server carries out ciphertext retrieval on the index table according to the attribute metainformation, returning the retrieval records meeting the conditions to the client so as to obtain documents corresponding to the attribute metainformation. The
system comprises a server and a plurality of clients, and the clients are respectively connected with the server through
the Internet. The method and the
system disclosed in the invention have the advantages that the security and retrieval efficiency of the ciphertext retrieval system are improved, and the expansibility is high.