What's the purpose of a passphrase in hybrid cryptography? can it actually be used for authentication or if i put in another signature algorithm will it be like, two authentications?
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There is not necessarily a password in hybrid cryptography, it depends on the scheme. What scheme are you referencing? – Maarten Bodewes Dec 05 '20 at 18:17
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Some systems like SSH will use passphrases to control the use of private keys: instead of storing the private key unencrypted on disk it's stored encrypted (symmetrically) by a key derived from a passphrase. That ensures that only an authorized user can use the SSH key pair to access a remote system.
There's no requirement for passphrases in hybrid cryptography in general. EG TLS doesn't use passphrases and involves hybrid cryptography (asymmetric key exchange + symmetric encryption).
SAI Peregrinus
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