Method for losslessly hiding information in data file

The invention provides a method for losslessly hiding information in a data file, secret information can be coded and embedded in the data file for transmission, and a receiving end can losslessly extract the secret information from the data file and also can extract generation parameters from the data file or a file name so as to losslessly recover carrier data with high quality. Under the condition that the information transmission rate is not increased, one eighth or more large data volume can be hidden in a data file, the hiding capacity is fixed, transmission confidentiality is achieved, the image data PSNR is always larger than 51 dB and can reach 60 dB or even infinity, and the method is suitable for various data safety transmission systems. 本发明提出了一种在数据文件中无损隐藏信息的方法，能在数据文件中编码嵌入秘密信息进行传输，接收端可以从数据文件中无损提取秘密信息，也能从数据文件或文件名中提取生成参数进而无损或高质量恢复载体数据。在不增加信息传输速率的情况下，能在数据文件中隐藏八分之一及以上的大数据量，且隐藏容量固定，具有传输保密性，图像数据PSNR总是大于51dB，可达60dB甚至无穷大，适用于各类数据安全传输系统。