A Study on BlockchainBased Lightweight Logging Framework for Service Availability in ResourceLimited Edge Cloud In the edge cloud, when two types of service providers provide edge nodes, each service provider has different logging areas, making it difficult to access QoS violations and complying with service level agreements (SLAs). Thus, the thirdparty broker plays a role of confirming QoS violations and compliance between the two providers, thereby securing reliability between the CSP and NP. In addition, by improving the existing logging technique in the edge cloud with limited resources, it reduces the CPU usage to improve the availability of cloud services. Therefore, we propose a brokerbased framework that improves the service availability by reducing the CPU usage and secures QoS compliance and violations.

An Anonymous BlockchainBased Logging System for Cloud Computing Cloud computing has been in increasing concentration these years. Nevertheless, recently, it suffers the ambiguity in discerning responsibilities for unexpected incapable services. At this time, people refer to the logs. However, since logs may judge the fault, they are susceptible to malicious modification. Thus, their integrity is vital. Existing solutions leverage blockchain technology to tackle this problem, but few of them take the pseudoanonymous nature of blockchain into considerations. This risks usersxe2x80x99 privacy when they anchor their logs onto the blockchain. Some solutions try to be anonymous, but they are not general enough to be practical. In this paper, we propose a blockchainbased anonymous logging system for cloud environment. Our system introduces zeroknowledge proof to realize anonymous authentication, which can ensure undeniability in auditing while doing no harm to anonymity. Through experimental evaluation, we evaluate the feasibility and anonymity of the proposed system.