Welcome to the resource topic for 2024/1292
Title:
Chosen Ciphertext Security for (Hierarchical) Identity-Based Matchmaking Encryption
Authors: Sohto Chiku, Keisuke Hara, Junji Shikata
Abstract:Identity-based matchmaking encryption (IB-ME) is an advanced encryption scheme that enables a sender and a receiver to specify each of identity. In general, from the aspect of abilities for adversaries, we have two flavors of security for encryption schemes chosen plaintext attacks (CPA) security and chosen ciphertext attacks (CCA) security. Compared to CPA security, CCA security can capture active adversaries, then it has been recognized as a desirable one.
In this paper, we investigate the CCA security for IB-ME.
Concretely, we provide the following three contributions. (i) A method to obtain a CCA secure IB-ME scheme in the standard model based on our new primitive called hierarchical IB-ME (HIB-ME) along with strong one-time signature. (ii) A construction of HIB-ME based on hierarchical identity-based encryption and hierarchical identity-based signature. (iii) A variant of the first method to get an IB-ME scheme satisfying slightly tweaked CCA security solely based on a CPA secure IB-ME scheme (without strong one-time signature). We believe that this new type of CCA security is a reasonable one for IB-ME.
ePrint: https://eprint.iacr.org/2024/1292
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