Alive+: A Private Cloud Messaging System for Android Devices

Conventional private messaging systems over the network often focus on the privacy problem but pay little attention to important performance qualities such as system reliability, scalability and fault tolerance. The existing systems usually meet the security requirements using verifiable shuffles to prevent a message loss or by generating an efficient noise across many servers using bloom filters. This paper introduces Alive+ system as a private cloud messaging to forward messages over the Android devices securely. Alive+ employs a cryptography scheme to guarantee the confidentiality of messaging process. Messages are encrypted and decrypted over the cloud server using AES algorithm and SHA-256 hash function to generate unique secret keys, thus strengthening Alive+ against possible network attacks. Alive+ is connected to a reliable cloud-based database designed to handle the user requests and communications efficiently. We evaluate the performance of Alive+ in terms of reliability, latency, and scalability under various scenarios and settings. The performance of Alive+ is also evaluated in terms of fault tolerance, CPU utilization, memory usage, and network traffic. The experimental results show that Alive+ is secure, reliable, and error-tolerant with high scalability levels, thereby serving a large number of users simultaneously.