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Cryptography is a good counter to your claim.

Maybe historically, before the public even had computers, but do you have anything to support your claim for cryptography in the modern era?

Historically is exactly what I was referring to. I do not have anything to support this for the modern era nor am I certain this still holds now.

It hasn't been true for over 20 years. If it were, the NSA would've done a much better job backdooring crypto [1]