With the rapid development of digitization, networking, and socialization, people's work and activities increasingly rely on digital devices and networks. While bringing us many conveniences, it also provides space and means for criminals. In the cases of online fraud, online gambling, online pornography, economic crimes, as well as traditional theft, intentional damage to property, fighting and other crimes handled by public security organs, more and more electronic data are involved to prove the facts of the crime and restore the truth. Therefore, the collection of digital data evidence has become increasingly crucial.