You seem to be under the impression that if you just work hard enough you can violate the fundamental constraints of reality.<p>I can&#x27;t comment on the mathematics involved but let us assume it&#x27;s mathematically possible. You engineer this mythical nearly foolproof backdoor. You can decrypt this text with any of two keys. (It&#x27;s my understanding that such algorithms actually exist already.) Congratulations you have achieved your goal. You have a working algorithm.<p>Now let&#x27;s examine the results of actually using this algorithm:<p>You now have <i>twice</i> the opsec problem you had before. You have transmit this second key to a Government agency securely. You have to trust that Government agency to securely store, use, and dispose? of this key when they obtain it.<p>And what is the number one threat to secure systems? Operational Security. In fact many security professionals will tell you that the hardest part of security isn&#x27;t the math behind the encryption. It&#x27;s the opsec. In one fell swoop you double the threat in the most fragile part of your security.