Quote from: OmegaStarScream on November 22, 2016, 12:57:16 PM

Quote from: piloder on November 19, 2016, 04:52:48 PM

Quote from: OmegaStarScream on November 19, 2016, 04:32:30 PM

If by importing the wallet.dat (private keys) means swapping them to other private keys on blockchain.info servers then the imported wallet will be useless but If someone puts his hands on the wallet.dat on the servers on blockchain then cracking it would be possible. wallet.dat contains a lot of information's[1][2][3] and there is some tools to read them[4] so I assume It's possible to read the addresses + balance without the need of cracking it, after having the addresses that contains a lot of BTC , the cracking begins process begins.

[1] https://en.bitcoin.it/wiki/Wallet
[2] http://bitcoin.stackexchange.com/questions/3173/what-information-does-a-wallet-contain
[3] http://bitcoin.stackexchange.com/questions/853/what-do-the-different-dat-files-contain/854#854
[4] https://github.com/jackjack-jj/pywallet

Thanks for info, i was already frighten from blockchain few months ago when they announce that their dns server got changed from their domain registrar account which i don't think can be possible without someone else hacking it.

So paper wallet and hard ware wallet are good choice or what about electrum? I think it doesn't have any server where they store wallet info.

Electrum is with no doubt a great choice and servers don't really store anything about the private keys so If you want a wallet to use daily or at least on a weekly basis then Electrum would be the way to go.
If you want to store for long term (and don't use your BTC for years) then Paper wallets are probably the best way. (just make sure to print different backups and store them in different places).

I ever to tried used Electrum, I think the features and secure is very good, but for me that have small account noy use again. I more like coinbase or xapo wallet, because simple, secure (always need sms verify) and good interface.