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Yes, there's an issue: you're adding needless complexity, which gives you absolutely no benefit. The whole point of a PBKDF is to be slow; passwords are low-entropy, and the only way to mitigate brute-force is to make it take time to compute hashes. It can't take too long to log in, so you have to balance "fast for a user" and "slow for an attacker." ...


Yes, it is possible to deterministically generate public/private RSA key pairs from passphrases. For even passable security, the passphrase must be processed by a key-stretching function, such as Scrypt (or the better known but less recommendable PBKDF2), and salt (at least, user id) must enter the key-stretching function; the output can then be used as the ...

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