I was reviewing how Electrum wallet protect my seed. They say this regarding seed protection:
Your seed and private keys are encrypted using AES-256-CBC.
Source: http://docs.electrum.org/en/latest/faq.html#how-is-the-wallet-encrypted
My question: AES-256 requires a 256 bit key; yet Electrum password's size is 12 characters as per Riaan Swart [1]. Where do the remaining 160 bits come from for the AES-256 encryption key?