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3

In the context of most Password Managers that use encryption, you will generate a Master Data Encryption Key (MDEK) which will serve to encrypt all the passwords and the user's password would be the Key Encrypting Key (KEK) to encrypt the MDEK. This way, the MDEK stays the same when you change your Master Password derived KEK that wraps the MDEK.


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Yes, the principle to use a common password and a unique salt per file with a key derivation function is a good and acceptable practice, as you generate the salt randomly and with the right size. The uniqueness of the salt guarantees a different password per file (actually one password per salt, so: do not reuse a salt, use a csprng). You forgot to mention ...



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