We present a new approach to the design of IND-CCA2 secure hybrid encryption schemes in the standard model. Our approach provides an efficient generic transformation from 1-universal to 2-universal hash proof systems. The transformation involves a randomness extractor based on a 4-wise independent hash function as the key derivation function. Our methodology can be instantiated with efficient schemes based on standard intractability assumptions such as Decisional Diffie-Hellman, Quadratic Residuosity, and Paillier’s Decisional Composite Residuosity. Interestingly, our framework also allows to prove IND-CCA2 security of a hybrid version of 1991’s Damgård’s ElGamal public-key encryption scheme under the DDH assumption.
|Translated title of the contribution||A New Randomness Extraction Paradigm for Hybrid Encryption|
|Title of host publication||Advances in Cryptology - EUROCRYPT 2009|
|Publisher||Springer Berlin Heidelberg|
|Pages||590 - 609|
|Publication status||Published - 2009|