What prevents a malicious user from deploying a contract to decrypt ciphertexts published on the blockchain? If the only input for transactions carried out by Remix is the ciphertexts (generated using the Command-Line Interface (CLI) tool), how do we know that the sender itself generated the ciphertext? Furthermore, if the owner of the ciphertext wants to decrypt his ciphertext published on the blockchain intentionally through a function in a smart contract, can he?