A tough nut to crack is a way to describe somebody who is difficult to get to know. They are secretive and private for whatever reason. Check out this video for all the details you need to know about this English idiom.
A tough nut to crack meaning: Someone who is difficult to get to know.
A tough not to crack origin: Used since the 1700's. Refers to how it's not easy to open a nut because of the hard shell. Depending on the nut, it's not possible to do it without a special tool.
Examples:
"She's a hard nut to crack. It's been years and I still have no idea if she's married or not."
"My boss is a hard nut to crack. I can't figure out if he likes me or not."
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