I wonder how easily my private key(s) ('secgring.gpg') can be cracked
once somebody get access to it.

No one with two brain cells to rub together will try brute-forcing a strong passphrase. No one. Assuming your passphrase is strong you could publish your secret key in the _New York Times_ and still be completely confident in the security of your communications.

Q: Is the password stored as an hash and can it be cracked using Rainbow
Tables? Is it maybe salted?

The passphrase isn't stored as a hash, so much as the passphrase is hashed (many, many times -- with salt) and the output is used to attempt to decrypt the secret key. The passphrase is never stored, though, either in plaintext or in hashed form.


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