The only possibility of private keys being hacked comes from the threat of quantum computers. ... That means that quantum computers can process much more information than just binary computation, which is the limit of classical computing systems.
Follow this link for full answer
Somehow, what do private keys look like?
In Bitcoin and many other cryptocurrencies, a private key is a 256-bit number, however, this is not the format that it is displayed in. The 256-bit number is represented in hexadecimal- a simpler form. In the early days of Bitcoin you would have one private key that was associated with one public key and one address.
As it, where can I find my bitcoin private key? Every Bitcoin wallet contains one or more private keys, which are saved in the wallet file. The private keys are mathematically related to all Bitcoin addresses generated for the wallet.
In any way, where are my private keys?
If you have not yet installed your certificate, then the most likely location of your private key is on the computer or server where you generated the key pair and CSR. When you generated the key pair, you saved two files: one that contains the public key and one that contains the private key.
How do I access my bitcoin wallet with a private key?
Tap on Settings. Under Currency Settings, tap on Bitcoin. Select Redeem Private Key. Tap on Scan Private Key and scan the QR code on your paper wallet.