After a discussion with a lawyer friend (not australia, canada, so tangentially related), the "presumption of innocence" that would not obligate this person to have or produce a key for whatever gibberish someone sends to their devices, is what's known in legal circles as a "principle of fundamental justice," and it is not a right that is either absolute or inaliable the way that american rights are set up. One doesn…
The entire tradition of thought around natural law and limits on the legitimate scope of the state have simply disappeared in Australia so far as I can tell. Everyone just accepts that the state has absolute sovereignty and it can pass any laws it wants. Commonwealth nations have largely devolved into illiberal elective autocracies with immense power concentrated in the PM's offices, minimal parliamentary autonomy (i…
Natural rights and an absolute sovereign aren't contradictory in the Anglo school of thought, see one of its most famous representatives, Thomas Hobbes. (There's no such thing as natural law, which is always a contractual human affair between the governor and the governed).
The particular American, Lockean version of liberalism you're talking about never had much sway in the Commonwealth, and Australia derives its traditions if anything from Britain, not the US.