FE-Schrift – Wikipedia

FE-Schrift - Wikipedia:

Terrorists changed the typeface of license plates in Germany.

The OPSEC practices of the Red Army Faction included using paint and tape to modify license plates (the font was suceptible to deception techniques.) The Germans created a font that cannot be modified for one character to mimic another.

This is done via a number of clever tricks (read the article), but mostly by making it so that the propotions of commong src -> dst modifications result in glyphs that are not the correct forms. For example altering a B to a 3 creates the wrong glyph for 3. This has been done for ever variation of possible source glyphs and modified glyphs. Very cool protection against a simple deception tactic.

The motivation for the creation of the typeface was spun in the late 1970s in the light of Red Army Faction terrorism when it was discovered that with the then-standard font for vehicle registration plates—the DIN 1451 font—it was particularly easy to modify letters by applying a small amount of black paint or tape. For example, it was easy to change a “P” to an “R” or “B”, a “3” to an “8”, or an “L” or “F” to an “E”. Modifications to FE-font plates are somewhat more difficult, as they also require the use of white paint, which is easily distinguished at a distance from the retroreflective white background of the plate, in particular at night.