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RE: Steem Private and Public Keys Demystified 🔐
Public keys are meant to be public, they're not 'exposed' or at risk. If you encrypt a message with my public key (doesn't matter what type of key it is), only ME can decrypt it with my private key. On the other hand, I can SIGN a message with my PRIVATE key and send it to you, and you can use my public key to authenticate that it was ME who signed it.
The posting, active, owner, memo keys are inventions of Steem to allocate different permissions to your account. The public/private key pairs are used by the system, not me or you, to authenticate the author or the transactions.
Maybe one day Steemit will evolve to a stage we can encrypt and decrypt it using its services and enable privacy control of our own keys. That would be nice.