The image is of a cloud. It is flat on the bottom with curves on top to show its fluffy shape. In the center of the cloud there is a keyhole shape, consisting of a bulbous top end with a small narrow extension sticking downward.
Related to Secure Cloud Icon
Related icons are the icons with matching tags, as well as all network icons. All icons are in the same flat style. You can either download free PNG icons or buy SVG vectors