A one-time pad has to be transmitted, too. MITM will crack it.
A one-time pad that needs to be transmitted can be violated by MITM. But if the relevant private mutual information is already shared or is shared directly without encryption then the encryption they use to communicate is not (in theory required to be) crackable. Since the claim was that “all encryption can be cracked in theory” it is not enough for some cases to be crackable, all must be.
A one-time pad that needs to be transmitted can be violated by MITM. But if the relevant private mutual information is already shared or is shared directly without encryption then the encryption they use to communicate is not (in theory required to be) crackable. Since the claim was that “all encryption can be cracked in theory” it is not enough for some cases to be crackable, all must be.