<a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Treyfer" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Treyfer</a> seems exceptionally short, even more so than RC4, and simple enough to memorize. Googling around suggests it&#x27;s still okay to use, too (but don&#x27;t use it as a hash).