Some General Results on Chosen-ciphertext Anonymity in Public-key Encryption

Tian Yuan

Paper 2007/190

Some General Results on Chosen-ciphertext Anonymity in Public-key Encryption

Tian Yuan

Abstract

In applications of public-key encryption schemes, anonymity(key-privacy) as well as security(data-privacy) is useful and widely desired. In this paper some new and general concepts in public-key encryption, i.e., “master-key anonymity”, “relevant master-key anonymity” and “key-integrity”, are introduced(the former two are defined for IBE schemes and the latter one is for any public-key encryption scheme). By the concept of master-key anonymity, we prove that chosen-plaintext master-key anonymity is a sufficient condition for chosen-ciphertext anonymity in the recent elegant Canetti-Halevi-Katz and Boneh-Katz construction. By the concept of key-integrity, we prove it is(together with chosen-plaintext anonymity)a sufficient/necessary condition for chosen-ciphertext anonymity. In addition to these general consequences, some practical examples are also investigated to show such concepts’ easy-to-use in practice.

Note: d

Metadata

Available format(s): PDF
Category: Public-key cryptography
Publication info: Published elsewhere. Unknown where it was published
Keywords: Anonymity Key-privacy Master-Key Anonymity Key-integrity
Contact author(s): tianyuan_ca @ sina com
History: 2007-05-22: received
Short URL: https://ia.cr/2007/190
License: CC BY

BibTeX

@misc{cryptoeprint:2007/190,
      author = {Tian Yuan},
      title = {Some General Results on Chosen-ciphertext Anonymity in Public-key Encryption},
      howpublished = {Cryptology {ePrint} Archive, Paper 2007/190},
      year = {2007},
      url = {https://eprint.iacr.org/2007/190}
}