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Like I wrote in the comment, the method here is pretty similar. The differences: Rather than deriving each site password directly from the password, I recommended deriving a single master secret using a password hash and then deriving the site passwords from that using another KDF. You are truncating the PBKDF2 output to 64 bits. You define the method of ...

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The keychain was moved to the Secure Enclave, the Apple WWDC 2015 Session 766 transcript states: "We also moved the KeyStore component from the kernel into Secure Enclave and it's that component which controls the cryptography around Keychain items and the data protection."" Thus both symmetric and asymmetric keys are now in the Secure Enclave if the ...

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I'm sorry, but chances are this doesn't work. The reason is of course that ECDSA signatures are usually fully randomized, meaning that there's randomness introduced in between the private key and the final signature. If you're looking at an ECDSA specification, the relevant value usually is called $k$. What you'd rather need would be an RSA encryption / ...

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