# Discovered Brainwallets

[Brainwallets](https://en.wikipedia.org/wiki/Cryptocurrency_wallet#Wallets) are cryptocurrency wallets with a private key that is directly generated from a human-chosen passphrase, not on entropy generated from a (potentially weak) random number generator. Additionally, the key derivation method is usually extremely fast, such as a fast hash algorithm operation.

This makes brainwallets extremely susceptible to offline brute-force attacks, so they're a great way to lose cryptocurrencies to attackers.