社群媒體與行動通訊技術的普及，使得具惡意目的之假新聞與假圖片以前所未有的速度與廣度傳播，對個人認知、社會秩序乃至國家安全構成嚴峻挑戰。此類虛假訊息不僅被用以誤導公眾、操縱輿論，更可能干預選舉、挑起社會衝突，嚴重威脅民主發展與社會安定。傳統上依賴「眼見為憑」的資訊驗證方式，在面對日新月異的影像偽造與人工智慧生成技術時顯得捉襟見肘，亟需更可靠的驗證機制用以確保資訊的真實性。本論文針對上述問題，探討當前網路假訊息的傳播特性與作假手法深入探討影像內容的偽造與辨識困境。為有效應對日益精密的影像偽造技術，本論文提出一種結合數位簽章與隱寫術的影像來源驗證機制，兼顧隱私性與安全性的輕量級影像來源驗證方案，巧妙地結合了隱寫圖片的資訊承載能力與非對稱式密碼系統的簽章驗證機制，以期構建更安全、更可信的網路資訊環境，有效遏制假圖片等虛假資訊的傳播，維護社會的穩定與安全。

The widespread use of social media and mobile communication technologies has enabled maliciously crafted fake news and fabricated images to disseminate at unprecedented speed and scale, posing serious challenges to individual cognition, social order, and even national security. Such misinformation is not only used to mislead the public and manipulate public opinion but can also interfere with elections and incite social conflict, thereby threatening democratic development and societal stability. Traditional verification methods that rely on “seeing is believing” have become increasingly inadequate in the face of rapidly evolving image forgery techniques and AI-generated content, underscoring the urgent need for more reliable mechanisms to ensure the authenticity of information. In response to these issues, this thesis examines the dissemination characteristics and fabrication techniques of online misinformation and investigates the challenges associated with image forgery and content authentication. To counter the growing sophistication of image manipulation technologies, the thesis proposes an image-source verification mechanism that integrates digital signatures with steganography. The resulting lightweight solution balances privacy and security by leveraging the information-carrying capability of steganographic images together with the signature-verification properties of asymmetric cryptographic systems. The goal is to establish a safer and more trustworthy online information environment, effectively curb the spread of fake images and other forms of disinformation, and uphold social stability and security.

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