| 摘要 |
A server and a client mutually exclusively execute server-side and client-side commutative cryptographic processes and server-side and client-side commutative permutation processes. The server has access to a hash table, while the client does not. The server and client perform a method including: encrypting and reordering the hash table using the server; communicating the encrypted and reordered hash table to the client; further encrypting and further reordering the hash table using the client; communicating the further encrypted and further reordered hash table back to the server; and partially decrypting and partially undoing the reordering using the server to generate a double-blind hash table. To read an entry, the client hashes and permute an index key and communicates same to the server which retrieves an item from the double-blind hash table using the hashed and permuted index key and sends it back to the client which decrypts the retrieved item.
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