Collusion Resistant Broadcast Encryption With Short Ciphertexts and Private Keys

Dan Boneh; Craig Gentry; Brent Waters

Paper 2005/018 Original: eprint.iacr.org/2005/018 ↗

Collusion Resistant Broadcast Encryption With Short Ciphertexts and Private Keys

Dan Boneh

Craig Gentry

Brent Waters

Abstract

We describe two new public key broadcast encryption systems for stateless receivers. Both systems are fully secure against any number of colluders. In our first construction both ciphertexts and private keys are of constant size (only two group elements), for any subset of receivers. The public key size in this system is linear in the total number of receivers. Our second system is a generalization of the first that provides a tradeoff between ciphertext size and public key size. For example, we achieve a collusion resistant broadcast system for n users where both ciphertexts and public keys are of size O(sqrt(n)) for any subset of receivers. We discuss several applications of these systems.

Metadata

Available format(s): PDF
Category: Public-key cryptography
Publication info: Preprint.
History: 2005-03-12: last updated; 2005-01-28: published
Short URL: https://ia.cr/2005/018
License: https://creativecommons.org/licenses/by/4.0/

BibTeX

@misc{cryptoeprint:2005/018,
      author = {Dan Boneh and Craig Gentry and Brent Waters},
      title = {Collusion Resistant Broadcast Encryption With Short Ciphertexts and Private Keys},
      howpublished = {Cryptology {ePrint} Archive, Paper 2005/018},
      year = {2005},
      url = {https://eprint.iacr.org/2005/018}
}