How is wallet at official client encrypted? What encryption it use?

What encryption does Bitcoin-qt use and what encryption is used at Multibit? And how strong that encryption is compared to other methods?

1 Answer 1


Both bitcoind and bitcoinj use AES-256 encryption for the private keys in their wallets (this does not mean that the wallet formats are compatible though).

Bitcoin-Qt is just a GUI on top of bitcoind and Multibit is using bitcoinj internally, so the same should apply to them.


  • what strength of AES?
    – Comodore
    Commented Nov 30, 2013 at 20:04
  • If by strength you mean key length it's 256 bit in both cases.
    – jnnk
    Commented Nov 30, 2013 at 21:34
  • ok, please add it to the post and add information how long does it take to crack it by supercomputers and how can quantum cryptography break that stuff.
    – Comodore
    Commented Dec 1, 2013 at 22:35
  • 1
    I don't know and I think this would be off-topic for this site. But I'm pretty sure you'll find the answer on Cryptography.
    – jnnk
    Commented Dec 2, 2013 at 17:16

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