Embedding information in text documents using glyph perturbation (2018) [pdf]
Take the letters &quot;a&quot; from the page 3, top right, and combine all them in your Gimp [0]. It&#x27;s amazing how it&#x27;s hard to distinguish those letters without the help of some tool.<p>I always thought about it when some people question, for example, the secrecy of the vote. When you&#x27;re given the ballot, there&#x27;s no way to know if all them are the same or if each one has some codified information without extensive audit. Even scanning all the ballots will introduce small imperfections that will make it hard to audit everything.<p>[0] Letters 0 and 1, letters 2 and 3: <a href="https:&#x2F;&#x2F;imgur.com&#x2F;a&#x2F;9v5W7Ib" rel="nofollow">https:&#x2F;&#x2F;imgur.com&#x2F;a&#x2F;9v5W7Ib</a>