What is a passphrase and how is it different from a password?

A passphrase is a sequence of words (e.g., "house-green-sea-blue-123") used as a password. It is easier to remember than a traditional password ("x7#kP9@m") and can provide greater security using the Diceware method, where 6 random words from a 7776-word dictionary generate ~77 bits of entropy.

How many words should a secure passphrase have?

At least 6 words are recommended for adequate security (~77 bits of entropy). For maximum security use 8-10 words (~103-128 bits). Each additional word adds ~12.9 bits of entropy when using the Diceware method with a 7776-word dictionary.

How does the Diceware method work?

Diceware is a method for creating secure passphrases using a 7776-word dictionary. You roll a die 5 times per word, and the 5-digit result (1-6) is looked up in the dictionary to get the word. This guarantees true randomness and calculable entropy of ~12.9 bits per word.

Secure Passphrase Generator - Diceware Method

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Why use passphrases?

Passphrases are more secure and easier to remember than traditional passwords.

Example: "Green-House-Run-123!" has ~50 bits of entropy
Equivalent password: "x7#kP9@m" needs more complexity to match
Memorable: Words are easier to remember than random characters
Long: 6+ words outperform short complex passwords

Entropy Guide

< 28 bits: Very weak (seconds to crack)
28-35 bits: Weak (hours)
36-59 bits: Fair (days)
60-127 bits: Strong (years)
> 128 bits: Very strong (centuries)

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Why use passphrases?

Entropy Guide

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