Not in practice. If you're talking about private keys in public-key-cryptography, those are usually encrypted with another private key, which exists only in yo

Not in practice. If you're talking about private keys in public-key-cryptography, those are usually encrypted with another private key, which exists only in your head. If you're talking about private keys in private-key-cryptography, they are either encrypted with a private key that only exists in your head, or they only exist in your head to begin with, or they are a "one-time" random private key, i.e. for a key exchange algorithm, that is not re-used. An OTP is not usually encrypted. We can AES it now, of course. But the point of the article is that encryption has gotten two orders of magnitude better. That point is still valid.