Outsourcing sensitive information to the cloud has become an imminent need these days. Privacy concerns related with cloud computing make the users more ardent on their data. This is because the service providers can access the data, re-distribute it to other third parties and even delete or alter their personal details. In this paper, we propose a method to enhance the security in multikeyword search for multi-owner and multi-user domain based on the digital signature scheme. Keywords from a particular file are extracted using the RAKE algorithm. Our scheme is a simplified version of how to impart security on existing PRMSM scheme. Security reasoning have shown that the suggested method can resist various cryptographic attacks.

Keywords : Cloud computing;Information Retrieval; RAKE;Public key based Digital Signature.