To expedite the forensic investigation process in the cloud, excessive and yet volatile data needs to be acquired,transmitted and analyzed in a timely manner. A common assumption for most existing forensic systems is that credible data can always be collected from a cloud infrastructure, which might be susceptible to various exploits. In this paper, we present the design, implementation, and evaluation of Live Foren, a system that enforces a trustworthy forensic data acquisition and transmission process in the cloud, whose computer platforms’ integrity has been verified. To fulfill this objective, we propose two secure protocols that verify the fingerprints of the computer platforms, as well as the attributes of the human agents, by taking advantage of the trusted platform module (TPM) and the attribute-based encryption (ABE).To transmit forensic data as a data stream and verify its integrity at the same time, a unique fragile watermark is embedded into the data stream without altering the data itself. The watermark allows not only the data integrity to be verified, but also any malicious data manipulation to be localized, with minimum communication overhead. The experimental results demonstrate that Live Forenachieves good scalability and limited performance overhead for authentication, data transmission, and integrity verification in an Infrastructure as a Service (IaaS) cloud environment.
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