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And usually towards the end of his lifetime.
It is possible to use accounts that contribute to the line (threshold accounts) as a key to encrypt other account credentials (thresholdless account). So an attacker can know any number of those thresholdless accounts and cannot crack other thresholdless account or the threshold accounts.
Can somebody please reexplain this in a way that a dumb child would understand?
A curious thing is that the last contact with the pilots was a handover from one ATC to another. The Malaysian ATC told them to contact Vietnamese ATC, which they acknowledged but never did. Normally, you'd do that right away (I think).