Check out the Wikipedia article <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Nothing_up_my_sleeve_number" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;Nothing_up_my_sleeve_number</a> for some examples:<p>ARIA uses 1&#x2F;π (indeed, why not pi?)<p>MD5 uses sin(n) (why not cos(n) or sqrt(n)?)<p>SHA-1 and SHA-2 use square roots and cube roots of small primes (why not sin(n) or pi?)<p>DFC uses e.<p>NewDES uses the United States Declaration of Independence.<p>RC5 uses both e and the golden ratio.<p>BLAKE uses &quot;a table of 16 constant words which are the leading 512 or 1024 bits of the fractional part of π&quot;. (Here you see how things like bit or byte order can give you more choices.)