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Paper 2004/028

Custodian-Hiding Verifiable Encryption

Joseph K. Liu and Victor K. Wei and Duncan S. Wong

Abstract

In a verifiable encryption, an asymmetrically encrypted ciphertext can be publicly verified to be decipherable by a designated receiver while maintaining the semantic security of the message \cite{AsokanShWa98,CamenischDa00,CamenischSh03}. In this paper, we introduce {\em Custodian-Hiding Verifiable Encryption}, where it can be publicly verified that there exists at least one custodian (user), out of a designated group of $n$ custodians (users), who can decrypt the message, while the semantic security of the message and the anonymity of the actual decryptor are maintained. Our scheme is proven secure in the random oracle model. We also introduce two extensions to decryption by a subset of more than one user.

Metadata
Available format(s)
PS
Publication info
Published elsewhere. WISA 2004
Keywords
Verifiable EncryptionPublicly VerifiableAnonymity
Contact author(s)
ksliu9 @ ie cuhk edu hk
History
2004-08-23: last of 3 revisions
2004-02-02: received
See all versions
Short URL
https://ia.cr/2004/028
License
Creative Commons Attribution
CC BY
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