&gt; Sigh. This is incorrect. Pi does not give the &quot;nothing up my sleeve&quot; property, because if I have a desired bit sequence in mind, I can find it in Pi, then retroactively claim that because it comes from Pi it wasn&#x27;t &quot;up my sleeve&quot;. Specifically, the methodology of transforming the its of Pi into the desired key was &quot;up my sleeve&quot;.<p>Pi has not been proven to be normal, so you can&#x27;t be <i>completely</i> sure that you could always find any particularly long (backdoored) sequence.