IACR News item: 06 July 2012
Juan Manuel Gonz{\\\'a}lez Nieto, Mark Manulis, Bertram Poettering, Jothi Rangasamy, Douglas Stebila
ePrint ReportWe identify a class of encryption schemes with \\emph{publicly verifiable ciphertexts} that admit generic constructions of (non-trivial) IND-CCA/CPA filters. These schemes are characterized by existence of public algorithms that can distinguish between valid and invalid ciphertexts. To this end, we formally define (non-trivial) public verifiability of ciphertexts for general encryption schemes, key encapsulation mechanisms, and hybrid encryption schemes, encompassing public-key, identity-based, and tag-based encryption flavours. We further analyze the security impact of public verifiability and discuss generic transformations and concrete constructions that enjoy this property.
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