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I just made two and more address in Bitcoin Core wallet.

  1. Is there any relationship to each address? Like based on seedphase? or Just literally making 'random' address?

  2. If so, an attacker can hack the other address if knows one of private key?

Thank you for your answer.

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Is there any relationship to each address? Like based on seedphase? or Just literally making 'random' address?

It depends.

In old versions of Bitcoin Core, addresses were just randomly generated and the private keys stored in wallet.dat.

Newer wallets that implement BIP32 derive all of the wallet private keys from one master private key.

If so, an attacker can hack the other address if knows one of private key?

If an attacker knows your 12 seed words, they can derive the private keys in your wallet and steal all of your coins, but this is no worse than an attacker having your wallet.dat.

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    Bitcoin Core uses BIP32, but not BIP39. There are no seed words, just a master key. If someone has access to your master key they can indeed generate all your future keys, but this is no different from them having access to your wallet file.
    – Pieter Wuille
    Mar 31, 2018 at 13:28

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