![]() ![]() They do not create phrases of 12 or 18 words. It's important to note that although a Ledger device can be restored using a recovery phrase of 12, 18, or 24 words, Ledger devices only generate 24-word recovery phrases. Each group of 11 bits is interpreted as a number in the range 0 - 2047, which serves as an index to the BIP 39 wordlist, giving us 24 words.All 264 bits are split into 24 groups of 11 bits.The first 8 bits of the SHA-256 hash of the initial 256 bits are appended to the end, giving us 264 bits. ![]() The device generates a sequence of 256 random bits using the True Random Number Generator (TRNG) built into the device’s Secure Element.Here’s how a BIP 39 24-word mnemonic seed is generated: The exact type of BIP 39 seed used by Ledger devices by default is a 24-word mnemonic that consists of only the 2048 words from the BIP 39 English wordlist. BIP 39 is an industry-standard used by many other hierarchical deterministic wallets. Ledger uses a standard called BIP 39 for the generation and interpretation of the recovery phrase on all of our devices. Once your device randomly generates it for the first time and you write it down on paper, you will only need to access it if you have to recover your device. Your recovery phrase isn’t like a password or a PIN (Ledger devices already have PINs to protect access to them), instead, it’s the root of all of your cryptographic secrets. ![]() As such, the recovery phrase should be something that is long and nearly impossible for anyone to guess. The recovery phrase is the key to managing your crypto assets. ![]()
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