The Iga Ninja Font was created by Stefan Imhoff of an image provided by the Iga Ninja Museum in Japan and is said to be a font for correspondence in cipher. The font can be downloaded on kogakure.de or from this repository.
This repository contains the OTF font, individual SVG, and an image with all characters, and the Glypr Studio project file.
The font is a historical font, why only Katakana are provided and some characters (e. g. ン) and diacritics are missing and instead some older characters are part of the font.
The font is provided under a licence of Creative Commons Attribution-NonCommercial 3.0 Unported (CC BY-NC 3.0).