You missed my point. You can't attack the cryptographic function or the keyspace, but you can attack the original passphrase that is hashed, via typical hash cracking methods (rainbow tables, bruteforcing, dictionary attacks, etc.). All you need to know is the hash function; most brainwallets use a single round of SHA256.
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You missed my point. You can't attack the cryptographic function or the keyspace, but you can attack the original passphrase that is hashed, via typical hash cracking methods (rainbow tables, bruteforcing, dictionary attacks, etc.). All you need to know is the hash function; most brainwallets use a single round of SHA256.