Paper 2012/155

Toward Practical Group Encryption

Laila El Aimani and Marc Joye

Abstract

A group encryption scheme allows anyone to form a ciphertext for a given group member while keeping the receiver's identity private. At the same time, the encryptor is capable of proving that some (anonymous) group member is able to decrypt the ciphertext and, optionally, that the corresponding plaintext satisfies some \apriori\ relation (to prevent sending bogus messages). Finally, in case of a dispute, the identity of the intended receiver can be recovered by a designated authority. In this paper, we abstract a generic approach to construct group encryption schemes. We also introduce several new implementation tricks. As a result, we obtain group encryption schemes that significantly improve the state of the art. Both interactive and non-interactive constructions are considered.

Metadata
Available format(s)
PDF PS
Category
Public-key cryptography
Publication info
Published elsewhere. Unknown where it was published
Keywords
Group encryptionCanetti-Halevi-Katz paradigmhomomorphic encryptionstructure-preserving signatures(non)-interactive zero-knowledge.
Contact author(s)
laila elaimani @ yahoo fr
History
2012-03-23: received
Short URL
https://ia.cr/2012/155
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2012/155,
      author = {Laila El Aimani and Marc Joye},
      title = {Toward Practical Group Encryption},
      howpublished = {Cryptology ePrint Archive, Paper 2012/155},
      year = {2012},
      note = {\url{https://eprint.iacr.org/2012/155}},
      url = {https://eprint.iacr.org/2012/155}
}
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