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Generate Encryption Passphrases

For full-disk encryption, GPG keys, or any cryptographic system that needs a memorable secret.

Nid oes angen mewngofnodi

...

48 bits
Entropy
8 hours
Crack time @ 10B guesses/sec

Why diceware? Memorable phrases of random words have huge entropy and are easier to remember than gibberish like β€œX#9mP$qZ”. A 5-word phrase has more entropy than a 10-character random password with mixed case + symbols.
πŸ”’ All randomness comes from crypto.getRandomValues() in your browser. No words, passphrases, or any data are sent anywhere.

Encryption tips

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LUKS, FileVault, BitLocker β€” all benefit from a strong recovery passphrase. Diceware makes one you can recover by writing words down individually.

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For GPG/PGP keys: a 5-7 word diceware phrase is industry-standard. The "use random words" pattern is documented in cryptocurrency wallet recovery as well (BIP-39).

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Print the phrase on paper, split it across two physical locations (e.g., 4 words at home, 3 at the office). Even thieves can't reassemble it.

Sut Mae'n Gweithio

1
Ewch i mewn
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2
Proses
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3
Lawrlwythwch
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Pam defnyddio ein un ni?

βœ“Hollol rhad ac am ddim - dim costau cudd, byth
βœ“Nid oes angen cyfrif, e-bost na mewngofnodi
βœ“Nid yw ffeiliau byth yn gadael eich dyfais
βœ“Dim cyfyngiadau maint ffeil o gwbl
βœ“Dim dyfrnodau ar unrhyw allbwn

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