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I have created an account in testnet which I know the address and the password of, but I did not backup the private key file. Can I somehow create the key file again using the password? Or is my account locked inside forever?

Thanks,

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    Your password has nothing to do with the creation of private key. However, the public and private key are mathematically related to each other but the strength of a public key cryptosystem lies on an assumption that private keys cannot be regenerated from public keys. So, there's no way to regenerate the private key.
    – galahad
    Nov 9, 2016 at 20:42
  • I figured out how to recover my lost UTC files. But I'm not going to tell you because apparently I'm too stupid.
    – Richard Bell
    Aug 15, 2017 at 0:10

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You cannot recreate the private key file. The password is used to decrypt the key file, and then an address is generated from the private key in a non-reversible way. The private key is really the most important piece and should be backed up.

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    @jeff: Geth works this way because the private key needs to be as random as possible (example) and humans are notoriously bad at entropy, and I loathe to mention it but a brainwallet is the term for a private key derived from a password fyi.
    – eth ♦
    Nov 9, 2016 at 17:31

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