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Erschienen in:
03.09.2016
A new randomized message-locked encryption in the standard model
Erschienen in: Peer-to-Peer Networking and Applications | Ausgabe 2/2018
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Abstract
In this paper, we propose a new construction for randomized message-locked encryption (MLE) with privacy chosen-distribution attacks (PRV-CDA) and strong tag consistency (STC) securities in the standard model via UCEs. The new construction is based on \(\mathsf {UCE}[\mathsf {S}^{sup}\cap \mathsf {S}^{q\text {-}query}]\) secure family of hash functions, adaptively secure non-interactive zero knowledge proof system (NIZK) and indistinguishable chosen-plaintext attacks (IND-CPA) secure symmetric encryption (SE). Compared with existing randomized MLE schemes such as Bellare et al.’s XtESPKE scheme (Eurocrypt 2013), our scheme gives concrete instantiation and detailed security proofs. Although Abadi et al.’s construction for randomized MLE (Crypto 2013) achieves STC and PRV-CDA2, but their construction is designed in the random oracle model and cannot be instantiated, while our scheme can be instantiated in the standard model and achieves both STC and PRV-CDA securities.