A data security prototype needs to be developed through secret messages to disguise messages sent in the desktop chat application youChat. We propose a model to simulate the plaintext information first encrypted by a cryptographic system to replace the plaintext information with ciphertext. The plaintext or plaintext entered into the desktop system becomes ciphertext; the receiver can use a key similar to the sender to read the message. The weakness of this proposal is that the random message system is not directly placed in the chat application; therefore, a message is still needed to terminate the process from the password system to the YouChat application. The advantage of using this model is that the sent message will not be easily re-encrypted by hackers, and it can be used in the computing part of the client.