Steganographic method with misguiding function of controllable secret key sequence

The invention relates to a text steganographic (secret writing) method with a misguiding function. The method comprises the steps of: opening a file, reading contents of the file, then replacing a keyword in the file with a keyword close, opposite or similar to the keyword in the file, and finally storing the file so that the misguiding function is achieved. The replacement of the keyword is achieved by adopting the combination of the fixed replacement and the floating replacement. The floating replacement is controlled by a secret key, a safe sequence generated by the secret key is used for carrying out tentative replacement, and if the replacement is not right, correction information can be added behind the secret key. Contents of the text subjected to steganography are possibly close, opposite or similar to contents of a hidden text, thus the misguiding effect can be obtained. The steganographic method is free of the defect that the traditional steganographic method needs large files of images, videos, audios and the like, and can directly misguide an opposite party.