user to make end-to-end encrypted VoIP calls to other RedPhone users. Flashback: An app that allowed the user to store encrypted backups of their device in the cloud. WhisperCore: An app that integrated with the underlying Android OS to protect everything the user kept on their phone. The initial beta featured full disk encryption, network security tools, encrypted backup, selective permissions, and basic platform management tools for Nexus S and Nexus One phones. WhisperMonitor: An app that worked with WhisperCore to provide a software firewall capable of dynamic egress filtering and real-time connection monitoring, giving the user control over where their data was going and what their apps were doing. See also List of mergers and acquisitions by Twitter References External links Android (operating system) software Cryptographic software Mobile software Secure communication Twitter, Inc. acquisitions 2011 mergers and acquisitions