Memorable passphrases, truly random.

A passphrase is a sequence of random words, like “correct-horse-battery-staple”. Because the unit of randomness is the whole word, passphrases are easy to remember and type while providing entropy equal to or greater than a random character string.

Diceware is a method of building passphrases by selecting random words from a numbered wordlist using dice. This tool does the same thing with a cryptographically secure random number generator instead of physical dice, drawing from an EFF-based short wordlist (1,193 words).

Each word from the wordlist adds about 10.2 bits of entropy. Four words (~41 bits) is fine for low-value accounts; six words (~61 bits) is strong; eight or more (~82 bits) is excellent for a master password.

Yes, for equal entropy. A 6-word passphrase (~61 bits) is comparable to a ~10-character fully random password, but far easier to remember. For the strongest accounts, use 8+ words or combine with a generated random password.