24-Word Passphrase Generator

A 24-word passphrase generator is a specialized tool that creates a sequence of 24 random words according to the BIP-39 standard. This standard is the foundation for secure cryptocurrency wallets and sensitive data protection systems.

These passphrases represent 256 bits of cryptographic entropy, creating approximately 115 quattuorvigintillion (1.15 × 10⁷⁷) possible combinations. To put this in perspective, this number is vastly larger than all the grains of sand on Earth and even exceeds the estimated number of atoms in the observable universe.

Unlike passwords, which rely on complexity, passphrases derive their security from length and randomness. Each word in the sequence represents 11 bits of data, with the final word containing an 8-bit checksum that validates the entire phrase. This checksum ensures that any transcription errors can be detected immediately.

The primary purpose of these passphrases is to generate the root seed for hierarchical deterministic (HD) cryptocurrency wallets. This single passphrase can derive millions of cryptographic keys while only requiring users to backup the original 24 words.

Step 1: Click the "Generate Passphrase" button to create a new 24-word sequence. The tool uses your browser's cryptographically secure random number generator to ensure true randomness.

Step 2: Carefully write down all 24 words in the exact order they appear. Use pen and paper for maximum security - never store digitally unless encrypted.

Step 3: (Optional) Add an extra passphrase (25th word) for enhanced security. This creates a hidden wallet behind your main passphrase.

Step 4: Verify your backup by selecting random words from your list. For example, confirm what word #7 and #19 are without looking at the entire phrase.

Step 5: Use the QR code or PDF export to create a secure offline backup. Store this backup in a fireproof safe or safety deposit box.

Step 6: When setting up your cryptocurrency wallet, enter the passphrase exactly as generated. Double-check each word before proceeding.

Important: Never share your passphrase with anyone. Treat it with the same security as you would physical cash or gold bullion.

Unbreakable Security: A 24-word passphrase provides 256 bits of entropy, making it resistant to brute-force attacks. Even with all the computing power on Earth, cracking it would take billions of years.

Universal Compatibility: The BIP-39 standard is supported by all major cryptocurrency wallets including Ledger, Trezor, Exodus, and MetaMask, ensuring seamless recovery across platforms.

Error Detection: The built-in checksum (last 8 bits) automatically detects transcription errors, preventing you from losing access to your assets due to a simple mistake.

Hierarchical Determinism: From a single passphrase, you can generate an unlimited number of cryptocurrency addresses, simplifying backup and recovery while maintaining privacy.

Plausible Deniability: With the optional 25th word feature, you can create hidden wallets that are impossible to detect without the additional passphrase, providing an extra layer of security.

Future-Proof: Unlike passwords that become vulnerable as computing power increases, the 256-bit security of a 24-word passphrase remains secure against all foreseeable technological advances, including quantum computing.

1. Entropy Generation: The generator creates 256 bits of true randomness using your device's cryptographically secure random number generator (CSPRNG). This entropy is the foundation of your passphrase's security.

2. Checksum Calculation: The SHA-256 hash of the entropy is computed, and the first 8 bits are used as a checksum. This checksum is appended to the original entropy, creating a 264-bit sequence.

3. Word Mapping: The 264-bit sequence is divided into 24 groups of 11 bits each. Each 11-bit number (0-2047) is mapped to a word in the BIP-39 wordlist for your selected language.

4. Passphrase Integration: If you've added an optional passphrase (25th word), it's combined with the 24-word mnemonic to create a unique salt value for the key derivation process.

5. Seed Derivation: Using PBKDF2 with HMAC-SHA512, the system performs 2048 iterations to derive a 512-bit master seed from your passphrase. This seed is the root of all your cryptocurrency keys.

6. Key Generation: The master seed is used with BIP-32/BIP-44 standards to generate hierarchical deterministic wallets that can create unlimited addresses while requiring only one backup.

The entire process happens locally in your browser - no sensitive data is transmitted over the internet. Once you close the page, all generated data is permanently erased from memory.