Security and Privacy for Storage and Computation in Cloud Computing

Abstract

The Secure Data Sharing in Clouds (SeDaSC) methodology that provides:data confidentiality and integrity, access control, data sharing (forwarding) without using compute-intensive re-encryption, insider threat security, and forward and backward access control. The SeDaSC methodology encrypts a file with a single encryption key. Two different key shares for each of the users are generated, with the user only getting one share. The possession of a single share of a key allows the SeDaSC methodology to counter the insider threats. The other key share is stored by a trusted third party, which is called the cryptographic server. We implement a working prototype of the SeDaSC methodology and evaluate its performance based on the time consumed during various operations.