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In this paper we present an electronic voting system based on homomorphic encryption to ensure privacy, confidentiality in the voting. Our proposal offers all the advantages of the multiplicatively homomorphic encryption cryptosystems. The proposed voting scheme is suitable for multicandidate elections as well as for elections in which contains neutral votes.

Cloud computing has now become a major trend, it is a new data hosting technology that is Very popular in recent years thanks to the amortization of costs it induces to companies. In this paper we present the major security issues in cloud computing and we also propose a simple, secure, and privacy-preserving architecture for inter-Cloud data sharing based on an encryption/decryption algorithm which aims to protect the data stored in the cloud from the unauthorized access.

Cloud computing gives another meaning to the word "sharing" in the world of networks. However, it gives rise to serious security problems. One of the techniques used by the attackers is the "Cloud cartography" which aims to locate a Virtual Machine in the cloud and launch a side channel attack.In this paper we propose a new technique for locating a virtual machine in a cloud environment. For this purpose, we will first trace the gateway of the cloud and then locate the target amongst the thousands of machines hosted in the cloud. Our attack is based on a new command TRACECL that can reach up to 100 routers, and we propose a method to locate the target Virtual Machine in a Cloud environment.