AITSteg: An Innovative Text Steganography Technique for Hidden Transmission of Text Message via Social Media
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With the popularity of smartphones and widespread use of high-speed Internet, social media has become a vital part of people’s daily life. Currently, text messages are used in many applications, such as mobile chatting, mobile banking, and mobile commerce. However, when we send a text message via short message service (SMS) or social media, the information contained in the text message transmits as a plain text, which exposes it to attacks. In some cases, this information may be confidential, such as banking credentials, secret missions, and confidential appointments; moreover, it is a major drawback to send such information via SMS or social media, as neither provides security before transmission. In this study, we propose a novel text steganography technique called AITSteg, which provides end-to-end security during the transmission of text messages via SMS or social media between end users. The AITSteg technique is evaluated by considering a trusted scenario. We then evaluate the efficiency of the proposed technique in terms of embedding capacity, invisibility, robustness, and security. The experiments confirm that the AITSteg is able to prevent various attacks, including man-in-the-middle attacks, message disclosure, and manipulation by readers. Moreover, we compare the experimental results with the existing techniques to show the superiority of the proposed technique. To the best of our knowledge, this is the first text steganography technique that provides end-to-end secure transmission of the text message using symmetric keys via social media.
随着智能手机的普及与高速互联网的广泛应用，社交媒体已成为人们日常生活的重要组成部分。当前，文本消息广泛应用于移动聊天、移动银行、移动商务等诸多场景。然而，当用户通过短消息服务（Short Message Service，SMS）或社交媒体发送文本消息时，消息所承载的信息将以明文形式传输，从而使信息暴露于各类攻击风险之中。在部分场景下，此类信息可能属于敏感内容，例如银行凭证、秘密任务与机密预约；此外，通过SMS或社交媒体发送此类信息存在显著安全缺陷，因为二者均未在传输前提供安全防护机制。本研究提出了一种名为AITSteg的新型文本隐写术（text steganography），可实现终端用户之间通过SMS或社交媒体传输文本消息时的端到端安全防护。本研究首先在可信场景下对AITSteg技术进行评估，随后从嵌入容量、不可见性、鲁棒性与安全性四个维度分析了所提技术的性能。实验结果证实，AITSteg能够抵御各类攻击，包括中间人攻击、消息泄露与接收方篡改。此外，本研究将实验结果与现有技术进行对比，以凸显所提技术的优越性。据我们所知，这是首个通过社交媒体、使用对称密钥实现文本消息端到端安全传输的文本隐写术方案。
