Now you are talking about change time (ctime) not creation time.
Ah, I assumed indeed that the original comment was about ctime. I was never talking about creation time. Sorry for the confusion.
And ctime changes doesn't means that someone messed the file.
Of course not.
And of course ctime should not be user changeable. But not for security reasons.
Look up some real-world examples of intrusions and how they were detected, or delve deeper into forensic discovery with The Coroner's Toolkit or its successor The Sleuth Kit. Fascinating stuff.
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