Anonymous encryption with partial-order subset delegation functionality

Authors:
Mingwu Zhang;Takashi Nishide;Bo Yang;Tsuyoshi Takagi
Affiliations:
College of Informatics, South China Agricultural University, Guangzhou, China and Institute of Mathematics for Industry, Kyushu University, Fukuoka, Japan;Information Technology and Security Laboratory, Kyushu University, Fukuoka, Japan;College of Informatics, South China Agricultural University, Guangzhou, China;Institute of Mathematics for Industry, Kyushu University, Fukuoka, Japan
Venue:
ProvSec'11 Proceedings of the 5th international conference on Provable security
Year:
2011

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Abstract

We present a general encryption model with partial order delegation ability, which is a generalized extension for hierarchical identity-based encryption, broadcast encryption and delegatable functional encryption, etc. We also construct a concrete anonymous encryption scheme with constant-size ciphertext which may perform key derivation with partial-order subset delegation functionality, and prove its security in the standard model including semantic security, anonymity, and delegation indistinguishability. We give some practical application scenarios and deployments for our scheme.