An SDA will protect you from casual intrusion but not from serious security services surveillance.

As to conform to the requirements of the Homeland Security web browsers have been required to scan for suspicious activity for quite some time.

You should be aware, that because of this, your password (pin or phrase) could be compromised the first time you use it, and that it would not be necessary to decrypt the ciphered text with a "brute-force" attack.

Therefore it is pointless to discuss whether 128 bit encryption is enough or not.

A regular normal user would have nothing to worry about, but if your ambitions are of an illegal nature then you should be aware that encryption does not make it fail safe.

You have been warned.