A trusted authority refers to an entity, individual, or system whose authenticity and integrity are accepted without requiring direct cryptographic verification by all participants. In centralized systems, this might be a certificate authority or a government body. In some blockchain contexts, it can refer to a consortium member or a specific oracle provider whose data is relied upon. The reliance on a trusted authority introduces a point of centralization but can improve efficiency and manageability.
Context
The role of a trusted authority is a subject of ongoing debate in the blockchain space, particularly concerning the balance between decentralization and practical implementation. While public blockchains aim to minimize trust in single entities, permissioned blockchains often leverage trusted authorities for governance and data validation. Future developments will likely involve hybrid models where cryptographic proofs reduce reliance on trust, alongside clearer standards for the accountability of trusted entities.
A blockchain-based mechanism distributes key generation for CP-ABE, resolving the centralized trusted authority problem and securing outsourced data access.
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