How to get passphrase from a private key?

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I have private key. How can I get passphrase for my bitcoin address.

Kasaram Bala

Posted 2017-07-10T10:24:44.710

Reputation: 1

Question was closed 2017-07-11T04:55:13.723

2What do you mean by "passphrase for your bitcoin address"? Addresses are not encrypted or password protected. Do you mean you have an encrypted copy of your private key (e.g. in an encrypted backup)? Or do you have a private key and you just want the corresponding address? – Andrew Chow – 2017-07-10T21:37:13.400

Answers

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Assuming you have a symmetrically encrypted copy of your private key, where the encryption key was derived from a passphrase, you would be trying to perform a known-plaintext attack. However, it should not be possible in polynomial time for a proper AES implementation, so I'm afraid you're out of luck.

arik

Posted 2017-07-10T10:24:44.710

Reputation: 135

Asked: 2017-07-10T10:24:44.710

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Active: 2017-07-10T21:13:10.090