Secure and {\sl Practical} Identity-Based Encryption

Details Secure and {\sl Practical} Identity-Based Encryption Secure and {\sl Practical} Identity-Based Encryption

2005-10-15

arxiv.org/abs/cs/0510042v1

Computer Science

Cryptography and Security

Scientific paper

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

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