Windows application needs an icon designed

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This customer received 28 icon designs from 14 designers. They chose this icon design from PowersDesign as the winning design.
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An icon is needed for an Windows-based desktop application that helps organizations prevent the use of bad passwords by users in their environments.
The key purpose of the application is around password protection. So some ideas you can consider basing a design on may include security, keys, users, passwords, safety, protection, etc.
Submissions must include a 128x128, 64x64, 32x32 and 16x16 pixel representation of the design. The design must look its best at 128x128 pixels, but should appear clean at 32x32 pixels. This is not a mobile app icon.
Important: An appropriate 16x16 pixel representation of the design needs to be included. A simplified version of the main design will be accepted, as we acknowledge there are not a lot of pixels to work with. This version should still have a visual connection to the full size icon. Submissions that simply shrink the larger icons down to 16x16 will not be considered.
Target Market(s)
IT professionals
Industry/Entity Type
Information Technology
Colors
Designer to choose colors to be used in the design.
Look and feel
Each slider illustrates characteristics of the customer's brand and the style your logo design should communicate.