Custodian-Hiding Verifiable Encryption

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

Paper 2004/028

Custodian-Hiding Verifiable Encryption

Joseph K. Liu, 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 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 Encryption Publicly Verifiable Anonymity
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: CC BY

BibTeX

@misc{cryptoeprint:2004/028,
      author = {Joseph K.  Liu and Victor K.  Wei and Duncan S.  Wong},
      title = {Custodian-Hiding Verifiable Encryption},
      howpublished = {Cryptology {ePrint} Archive, Paper 2004/028},
      year = {2004},
      url = {https://eprint.iacr.org/2004/028}
}