Secure and \sl Practical Identity-Based Encryption
<|reference_start|>Secure and \sl Practical Identity-Based Encryption: In this paper, we present a variant of Waters' Identity-Based Encryption scheme with a much smaller public-key size (only a few kilobytes). We show that this variant is semantically secure against passive adversaries in the standard model.\smallskip   In essence, the new scheme divides Waters' public key size by a factor $\ell$ at the cost of (negligibly) reducing security by $\ell$ bits. Therefore, our construction settles an open question asked by Waters and constitutes the first fully secure {\sl practical} Identity-Based Encryption scheme<|reference_end|>
@article{naccache2005secure,
    title={Secure and {\sl Practical} Identity-Based Encryption},
    author={David Naccache},
    journal={arXiv preprint arXiv:cs/0510042},
    year={2005},
    archivePrefix={arXiv},
    eprint={cs/0510042},
    primaryClass={cs.CR}
}