Universally Composable Symmetric Encryption

For most basic cryptographic tasks, such as public key encryption, digital signatures, authentication, key exchange, and many other more sophisticated tasks, ideal functionalities have been formulated in the simulation-based security approach, along with their realizations. Surprisingly, however, no such functionality exists for symmetric encryption, except for a more abstract DolevYao style functionality. In this paper, we fill this gap. We propose two functionalities for symmetric encryption, an unauthenticated and an authenticated version, and show that they can be implemented based on standard cryptographic assumptions for symmetric encryption schemes, namely IND-CCA security and authenticated encryption, respectively. We also illustrate the usefulness of our functionalities in applications, both in simulation-based and game-based security settings. 

• Type: Conference
• Year: 2009
• Where: CSFW
• Authors: Ralf Küsters, Max Tuengerthal
• Keywords: CSFW 2009, Public Key Encryption, Security Privacy, Simulation-based Security Approach, Symmetric Encryption