Maybe generalize that further, a right to privacy.
But the term privacy is not very rigid. It can be taken and interpreted in various ways. It's certainly a good thing to mention it, but encryption needs to be mentioned explicitly, spelled out even.
There cannot be any room for interpretation: citizens have a right to encrypt their communication, end-to-end with their intended party.
People have a right to encrypt their communication, end-to-end with their intended participants, such that no one other than their intended participants can decrypt any aspect of their communication.
Let's give them a good fight.
Possibly the wrong goal.
How about "Let's win." instead? :)