Compact Identity-Based Encryption without Strong Symmetric Cipher

Authors

Joon Sang Baek, University of WollongongFollow
Jianying Zhou, Institute for Infocomm Research SingaporeFollow

RIS ID

117544

Publication Details

Baek, J. & Zhou, J. (2011). Compact Identity-Based Encryption without Strong Symmetric Cipher. ACM Symposium on Information, Computer and Communications Security (ASI- ACCS 2011) (pp. 61-70). ACM.

Abstract

In order to construct a CCA-secure (i.e. secure against chosen ciphertext attack) public key encryption scheme using the usual KEM/DEM (Key Encapsulation Mechanism/ Data Encapsulation Mechanism) framework, one needs KEM and DEM schemes, both of which are CCA-secure. A CCAsecure DEM scheme can be constructed in a various way, but in order to construct a hybrid scheme producing ciphertexts of compact size, the DEM scheme needs to be a length preserving symmetric cipher.