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SHA-512 is a cryptographically secure hash, PBKDF2 is what we call a Password Based Key Derivation Function. If the resulting secret isn't used as key but as hash value it's also called a password hash. Password hashes differ from secure hashes in the sense that they contain a salt and a work factor / iteration count. Both are however one way functions ...


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Those are calculated using the "SHA-512/t IV Generation Function", as described in FIPS-180 (pdf, see 5.3.6), the Secure Hash Standard. The procedure is to first modify the normal SHA-512 IV, then calculate the hash of a string describing the truncation mode used, and use that as the IV. Those IVs are essentially just predefined hash outputs and so not any ...



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