Disclosed are methods, systems, and computer-readable medium to perform operations including: generating a font that includes a plurality of glyphs for characters of a language; generating a plurality of duplicate glyphs for the characters, wherein each duplicate glyph is associated with: (i) a respective letterform representing one of the characters, and (ii) a respective glyph code; swapping the respective letterforms of the plurality of duplicate glyphs such that the respective letterforms are mismatched with the respective glyph codes; designating the plurality of duplicate glyphs as a scrambling font style of the font; and providing a representation of the font for output on a graphical user interface (GUI) displayed on a display device.