There&#x27;s an idea used in crypto commonly called &quot;reasonable security&quot;. Anything is possible given an computationally unbounded adversary, but the <i>point</i> of strong crypto is to make it such that cracking the crypto takes an &quot;unfeasible amount&quot; of time. Crypto isn&#x27;t some spectrum like waterproofing is, it&#x27;s binary:  either broken or it&#x27;s &quot;will be broken&quot;.