短語詞組短語Single Cryptograph 破解單個密文cryptograph protection 密碼保護threshold cryptograph 門限加密cryptograph index 密文檢索Homomorphic Cryptograph 同態(tài)加密certificateless cryptograph 無証書密碼學group cryptograph 分組密碼Cryptograph Sharing 密文共享quantum cryptograph 量子密碼 返回 cryptograph