I think techncially it's possible for certain operations using homomorphic encryption[1], where operations performed on encrypted data result in an appropriate

I think techncially it's possible for certain operations using homomorphic encryption[1], where operations performed on encrypted data result in an appropriate transformation of the plaintext data, but I am fairly certain that's not widely used, and I think Amazon would make a big deal out of it if it were used with the Echo. [1] https://en.wikipedia.org/wiki/Homomorphic_encryption https://en.wikipedia.org/wiki/Homomorphic_encryption