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It's true pywallet can perform search on storage drive. But Bitcoin Core use password in order to encrypt wallet.dat file. So you still need to specify the password/passphrase.
Ok,so is this password that encrypts the wallet.dat file the same format as the private keys or is it a password to gain acces to core's function of sending the contents of wallet.dat to another adress?
1. The password used to encrypt sensitive data (such as private key and master private key) on each wallet.dat file.
2. Bitcoin Core itself doesn't have feature to lock/unlock feature using password.