Towards Black-Box Accountable Authority IBE with Short Ciphertexts and Private Keys

@inproceedings{Libert2009TowardsBA,
  title={Towards Black-Box Accountable Authority IBE with Short Ciphertexts and Private Keys},
  author={Beno{\^i}t Libert and Damien Vergnaud},
  booktitle={Public Key Cryptography},
  year={2009}
}
At Crypto’07, Goyal introduced the concept of Accountable Authority Identity-Based Encryption as a convenient tool to reduce the amount of trust in authorities in Identity-Based Encryption. In this model, if the Private Key Generator (PKG) maliciously re-distributes users’ decryption keys, it runs the risk of being caught and prosecuted. Goyal proposed two constructions: the first one is efficient but can only trace well-formed decryption keys to their source; the second one allows tracing… CONTINUE READING