that would be a right to encrypt, not a right to privacy. the 'right to privacy', as established in the US, constitutes a 'reasonable expectation of privacy' that is - if you passively (e.g hiding behind a wall) or procatively (enclosing a letter in an envelope) take measures to hide what you are doing then you have the legal right to go after someone who tries to breach this privacy.
In the context of encryption, A right to encrypt says that no one can stop you from encrypting your work. A right to privacy says no one is allowed to try to break your encryption.
In the context of encryption, A right to encrypt says that no one can stop you from encrypting your work. A right to privacy says no one is allowed to try to break your encryption.