Optimal Security Notion for Decentralized Multi-Client Functional Encryption

ePrint Report: Optimal Security Notion for Decentralized Multi-Client Functional Encryption

Ky Nguyen, Duong Hieu Phan, David Pointcheval

Research on (Decentralized) Multi-Client Functional Encryption (or (D)MCFE) is very active, with interesting constructions, especially for the class of inner products. However, the security notions have been evolving over the time. While the target of the adversary in distinguishing ciphertexts is clear, legitimate scenarios that do not consist of trivial attacks on the functionality are less obvious. In this paper, we wonder whether …

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