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20250128_134809_the-13th-letter_equivalent_hmac_key.md
Document the vault "interchangable passphrases" artefact in the changelog
Marco Ricci
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at 2025-01-28 14:09:47
20250128_134809_the-13th-letter_equivalent_hmac_key.md
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### Added - [`Vault`][derivepassphrase.vault.Vault] now can report on whether two master passphrases are interchangable with respect to the service passphrases they can derive. This is an artefact of how the master passphrase is converted to the random bit sequence with which the service passphrases are generated. See the corresponding [FAQ entry: What are "interchangable passphrases" in vault?][INTERCHANGABLE_PASSPHRASES] for details, including the practical security (non-)implications. The `derivepassphrase vault` command-line interface does not address this in any manner, mostly because the "non-standard" interchangable variants of a given master password tend to be ugly to type in, and because they do not have practical security implications. [INTERCHANGABLE_PASSPHRASES]: ../explanation/faq-vault-interchangable-passphrases.md
