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When a message is encrypted with John's public key, it ensures that only John's corresponding private key can decrypt it. This asymmetric encryption process is foundational to public key cryptography, where each participant has a pair of keys: one public and one private.

The public key is openly shared and used to encrypt messages, while the private key is kept secret and is the only key capable of decrypting those messages. Therefore, if someone wants to send a confidential message to John, they would use his public key to encrypt it. Once encrypted, only John's private key can revert that ciphertext back to its original plaintext.

This showcases the innate security offered by asymmetric encryption, as it allows for safe communication without needing to share private keys. In this context, John's corresponding private key is the only correct approach to unlock or decrypt the message initially secured with his public key.