👉 In cryptography, a "subconcealed message" refers to a message that is encrypted using a secret key and then sent over a secure channel. The sender keeps the ciphertext (the encrypted version of the message) confidential, while the receiver can only access it through a trusted party or by performing a decryption process. The term was introduced in 1982 by Alan Turing, who defined subconcealed communication as "a form of communication that is not directly observable to any person other