What if unbreakable cryptography doesn't exist?

This isn't facetious. We do not yet know which of Impagliazzo's Five Worlds [0] we inhabit. Currently, the best guess is that we live in Cryptomania, but we haven't proven it. Since we would have to live in Cryptomania for your proposal to carry any reasonable weight, we should probably postpone any talk of adding to the list of human rights.

On the other hand, the ability to multiply numbers, while perhaps not a right, is something that the government should probably not bother trying to criminalize.

[0] http://blog.computationalcomplexity.org/2004/06/impagliazzos...