Sciweavers

Share
EUROCRYPT
2004
Springer

Chosen-Ciphertext Security from Identity-Based Encryption

10 years 3 months ago
Chosen-Ciphertext Security from Identity-Based Encryption
Abstract. We propose a simple and efficient construction of a CCAsecure 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 “weak” 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 “well-formedness” 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 hierarchica...
Ran Canetti, Shai Halevi, Jonathan Katz
Added 01 Jul 2010
Updated 01 Jul 2010
Type Conference
Year 2004
Where EUROCRYPT
Authors Ran Canetti, Shai Halevi, Jonathan Katz
Comments (0)
books