Sursen Corporation

Beijing Sursen International Information Tech Co.

De Ouyang

Peng Gao

Donglin Wang

Changwei Liu

Ningsheng Liu

Yunming Zhang

Yongzhi Lou

Shutian Yin

Yuansong Liang

A novel method is disclosed for detecting hidden information in a document comprising characters, including: determining layout transformation for each character in the document for detection compared with the original document; obtaining a code sequence embedded in the document for detection based on the layout transformation of each character in the document for detection and the predetermined embedding rule; decoding the code sequence to get the hidden information embedded in the document for detection.

Embedding and detecting hidden information

A novel method is disclosed for embedding hidden information in a document comprising characters, including: determining hidden information to be embedded in each class of layout transformation respectively; acquiring a code sequence for each class of layout transformation by coding the hidden information to be embedded in the class of layout transformation; performing layout transformation on characters from the document according to the acquired code sequence for each class of layout transformation respectively.

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De Ouyang