Abstract: Disclosed herein is a text security method. The text security method encrypts both a font and a text constituting a text document in the same manner so that the encrypted text can be correctly viewed only when the encrypted font is provided. The text is encrypted by changing, in a regular manner, positions of intrinsic character images or intrinsic codes of the text within different code areas, and the font is encrypted by changing, in the same regular manner, positions of intrinsic character images or intrinsic codes of glyphs of the font corresponding to the text within different font areas.