Memorable Password Generator: Easy to Remember, Hard to Crack

Generate Memorable Yet Secure Passwords

The tension between security and memorability is solved by passphrases: sequences of random words that are easy for humans to remember but extremely difficult for computers to guess. The famous XKCD comic #936 demonstrated that \"correct horse battery staple\" (four random common words) has more entropy than \"Tr0ub4dor&3\" (a complex but short password) while being far easier to remember.

The Diceware Method

Diceware is a method for generating passphrases using physical dice and a word list of 7,776 words (6^5). Each word adds approximately 12.9 bits of entropy:

1. Roll five dice — each roll produces a 5-digit number (e.g., 16655)
2. Look up the word — find the number in the Diceware word list (16655 = \"clause\")
3. Repeat 5-7 times — for 5 words you get 64.6 bits; 6 words gives 77.5 bits; 7 words gives 90.4 bits

Example passphrase: correct horse battery staple frozen — five words, 64.6 bits of entropy, trivial to memorize with a mental image.

How Many Words Do You Need?

For most personal accounts, 5-6 words is sufficient. For high-security applications like password manager master passwords or encryption passphrases, use 7+ words.

Memory Techniques

The power of passphrases comes from creating vivid mental imagery. For \"correct horse battery staple frozen\":

• Picture a horse wearing a gold star ("correct") eating a battery while stapling frozen documents
• The more absurd and vivid the image, the more memorable it becomes
• Write it down once and practice typing it 5-10 times; then destroy the paper

Entropy vs Memorability Tradeoffs

Adding modifiers can increase entropy while keeping the passphrase memorable:

• Capitalize one word randomly — adds ~2.3 bits for a 5-word passphrase
• Insert a number between two words — adds ~3.3 bits (10 digits) plus positional entropy
• Add a symbol separator — \"correct-horse-battery-staple\" is slightly stronger and still easy to type

However, the simplest improvement is always to add another word. One more random word adds 12.9 bits, more than any modifier trick.