@article {15078,
	title = {Chosen-ciphertext security from identity-based encryption},
	journal = {Advances in Cryptology-Eurocrypt 2004},
	year = {2004},
	month = {2004///},
	pages = {207 - 222},
	abstract = {We propose a simple and efficient construction of a CCA-secure public-key encryption scheme from any CPA-secure identity-based encryption (IBE) scheme. Our construction requires the underlying IBE scheme to satisfy only a relatively {\textquotedblleft}weak{\textquotedblright} notion of security which is known to be achievable without random oracles; thus, our results provide a new approach for constructing CCA-secure encryption schemes in the standard model. Our approach is quite different from existing ones; in particular, it avoids non-interactive proofs of {\textquotedblleft}well-formedness{\textquotedblright} which were shown to underlie most previous constructions. Furthermore, applying our conversion to some recently-proposed IBE schemes results in CCA-secure schemes whose efficiency makes them quite practical.Our technique extends to give a simple and reasonably efficient method for securing any binary tree encryption (BTE) scheme against adaptive chosen-ciphertext attacks. This, in turn, yields more efficient CCA-secure hierarchical identity-based and forward-secure encryption schemes in the standard model.
},
	doi = {10.1007/978-3-540-24676-3_13},
	author = {Canetti,R. and Halevi,S. and Katz, Jonathan}
}
