※ 비대면, 줌 주소 별도 공지 In quantum data hiding schemes, quantum states are used to hide information between two or more parties so that they cannot recover the information individually. However, the security of those schemes has not yet been demonstrated analytically. In this dissertation, we consider the problem of hiding classical data using two-quantum bit(qubit) separable states and show that the separable hiding scheme is secure if the qubits held by one party are spatially separated. We further provide the maximum success probability of discriminating between the two separable hiding states when only local operations and classical communication are allowed among parties.