论文标题
在不受信任的用户和监狱长在场的情况下,联合信息理论保密和秘密沟通
Joint Information Theoretic Secrecy and Covert Communication in the Presence of an Untrusted User and Warden
论文作者
论文摘要
在本文中,我们研究了单输入多输出(SIMO)系统中的联合信息理论保密和秘密通信,在该系统中,发射机(Alice)正在与两个合法用户(Bob和Carol)进行通信。我们认为,网络中还存在一个不受信任的用户和监视器节点,试图分别攻击向鲍勃和卡罗尔的安全和秘密通信。具体来说,鲍勃需要安全的通信,以使未经信任的用户没有解码他的爱丽丝的消息,而卡罗尔则需要秘密通信,以使看守没有检测到她来自爱丽丝的消息。 为此,我们认为爱丽丝在选定的时间插槽中传输了卡罗尔的消息,以将其隐藏在监狱长中,同时每次都在有争议的时段传输鲍勃的消息。 我们制定了一个优化问题,目的是最大程度地提高秘密通信要求和安全通信约束的平均利率。 由于提出的优化问题是非凸面,因此我们利用连续的凸近似来获得可拖动的解决方案。我们考虑了实用的假设,即爱丽丝对鲍勃和卡罗尔的监狱长位置和不完美的渠道状态信息(CSI)的了解不完美。 我们的数值示例强调,与BOB的不完美CSI相比,Carol的不完美CSI对平均率有更大的影响。
In this paper, we investigate joint information theoretic secrecy and covert communication in a single-input multi-output (SIMO) system where a transmitter (Alice) is communicating with two legitimate users (Bob and Carol). We consider that an untrusted user and a warden node are also present in the network attempting to attack the secure and covert communications to Bob and Carol, respectively. Specifically, Bob requires secure communications such that his messages from Alice are not decoded by the untrusted user, while Carol requires covert communications such that her messages from Alice are not detected by the warden. To do so, we consider that Alice transmits Carol's messages during selected time slots to hide them from the warden while also transmitting Bob's messages in each time slot contentiously. We formulate an optimization problem with the aim of maximizing the average rate subject to a covert communication requirement and a secure communications constraint. Since the proposed optimization problem is non-convex, we utilize successive convex approximation to obtain a tractable solution. We consider practical assumptions that Alice has imperfect knowledge of the warden's location and imperfect channel state information (CSI) of Bob and Carol. Our numerical examples highlight that the imperfect CSI at Carol has a more detrimental impact on the average rate compared to imperfect CSI at Bob.