Zabezpieczenia AES and other 85,000 icons from Icons8 icon pack follow the visual guidelines of the operating systems: Windows, iOS, Android KitKat, and Material. PNG format is free up to 100x100 px. Icons are availble for download in PNG and vector (SVG, PDF, EPS, and more).
There is a badge that looks like a shield, it has one point on top and spread symmetrically to two other points, then goes down to one point for the base of the shield. Written in the middle in all-caps are the letters AES.