Kerckhoffs' principle: security should depend on the secrecy of the keys, not of the algorithm. Do you object to PGP or PKCS#7 because they attach metadata to t

Kerckhoffs' principle: security should depend on the secrecy of the keys, not of the algorithm. Do you object to PGP or PKCS#7 because they attach metadata to the encrypted data, so that the attacker knows which cipher/key they should be cracking?