Hi
I’ve lost my password for bitcoin wallet

But I have unencrypted backup of the wallet that was made year ago.
Unfortunately, bitcoins stored on addresses that contained only in ciphered wallet, not in unencrypted backup.
But some of addresses contained in both the ciphered wallet and unencrypted backup

I have idea:
- choose any address that contained in both the ciphered wallet and unencrypted backup
- extract private key for address from unencrypted backup
- extract ciphered private key from ciphered wallet
- compare two extracted strings and get password for the wallet

I have superficial knowledge of cryptography, but this should work

Anyone know about software that can do what I described?