2014年，Tsai等人提出基於動態載入之AndroidApp 防複製攻擊機制，不僅每次執行前須向伺服器下載完整的一次性分離程式檔 (即數位內容)。再者，App 使用者經合作收集資訊，共謀製作出解密金鑰，進一步非授權取得與執行App 內容。因此，本論文主要研究動態金鑰管理機制，防制App 非授權的行為、抵禦App 使用者的共謀攻擊、有效保護分離程式檔，且能降低每次與伺服器資料傳輸的通訊成本。本機制亦可達到有效性、機密性、完整性、連結性、可追蹤性、共謀攻擊、抵抗中間人攻擊及抵抗重送攻擊等安全需求。

In 2014, Tsai et al. presented an android App copy protection mechanism based on dynamic loading. However, it has large communication cost with server and risky to start a pirate broadcast situation. Although server give authorized parties cryptographic keys allowing them to decrypt a class separation segment (as digital content), it does not prevent one of those authorized to view the separation segment from transferring the plaintext format to some unauthorized party. That is to say, the (set of) authorized user(s) may combine their information to generate a pirate decoder, so that other non-authorized parties execute App . We called collusion attack, and these non-authorized parties are called pirate users.
In this paper, we propose a Dynamic Key Management Mechanism based on dynamic loading and dynamic traitor tracing scheme to against collusion attacks, cost down communication cost and effectively protect the class separation segment. In addition, we can satisfy these requirements: effectiveness, confidentiality, robustness, binding, traceability, collusion attacks resistance, man-in-the-middle-attack resistance and replay-attack resistance.

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