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Yeah, thats just due to the specific cables. There's a slight but important difference from encrypted files to a signed file. The N55 cars aren't encrypted either, but the RSA signature was harder to break than say, MSD80, which has big security flaws (thankfully).
The RSA sig still has to be worked around, but if the files were encrypted that would be nearly impossible.
The dumb thing is the files are encrypted when they send them to you, but you can just read the tune right back out of the DME after flashing, so its pointless. I'm sure there are many reasons why BPC stopped using the Simon cables.
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