2003 | OriginalPaper | Buchkapitel
Practical Verifiable Encryption and Decryption of Discrete Logarithms
verfasst von : Jan Camenisch, Victor Shoup
Erschienen in: Advances in Cryptology - CRYPTO 2003
Verlag: Springer Berlin Heidelberg
Enthalten in: Professional Book Archive
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This paper addresses the problem of designing practical protocols for proving properties about encrypted data. To this end, it presents a variant of the new public key encryption of Cramer and Shoup based on Paillier’s decision composite residuosity assumption, along with efficient protocols for verifiable encryption and decryption of discrete logarithms (and more generally, of representations with respect to multiple bases). This is the first verifiable encryption system that provides chosen ciphertext security and avoids inefficient cut-and-choose proofs. The presented protocols have numerous applications, including key escrow, optimistic fair exchange, publicly verifiable secret and signature sharing, universally composable commitments, group signatures, and confirmer signatures.