Were the satellite pings from MH370's ACARS system spoofed?

[apples and oranges]

Or simply wrong? ACARS also showed Flight 175 received ACARS messages twenty minutes after it struck the WTC on 911.

((June 1, 2006)) Manufacturers of ACARS radios have made low-level encryption software available over the last five years. But few carriers have adopted it, given the industry's financial straits and the difficulty of implementing and administering the solutions. Nor are those solutions standard. Two domestic airlines and one or two international airlines are believed to be using this security software.

So far, ACARS messaging seems to have been relatively incident-free. "I don't think we've ever seen an instance of spoofing," comments Arnold Oldach, principal marketing manager for surveillance and data link products with Rockwell Collins Commercial Systems. (Spoofing is when an outsider is able to pose as the sender of a message.) The worst thing that has occurred, experts say, was the apparent decoding of an ACARS message about a passenger disturbance, which made its way into a newspaper.

http://www.aviationtoday.com/av/issue/feature/Securing-ACARS-Data-Link-in-the-Post-911-Environment_955.html