ECB mode encryption is like the kind of cereal box cyphers you probably played with as a kid. For any given key, a fixed block of data goes in, a fixed block of

ECB mode encryption is like the kind of cereal box cyphers you probably played with as a kid. For any given key, a fixed block of data goes in, a fixed block of data comes out. It won't usually be the whole of the password, but maybe "password" comes out as "94a012e6de4f1f0e" always. And so if you can guess that, then you're halfway to guessing "password123" and "passwordQWERTY" and so on. In general, using any mode of encryption (rather than hashing) on passwords is dumb. But this is dumber than usual.