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With the increasing popularity of office automation, text has become an important carrier of information storage and transmission. According to the features of small capacity and low security for text information hiding methods, the paper put forward the new safety enhanced formatted text information hiding method based on Kerckhoffs criterion and Cantor expansions. The encoding method of hiding information and the whole information hiding process were designed. And also the condition, hiding capacity, safety and applicability of the method were analyzed. The experimental results show that the proposed method has better information hiding capacity, higher security and wider scope of application.