According to Guangming.com, China's first "Cryptography Law" was reviewed and approved and will be implemented on January 1, 2020. Wu Shenkuo, executive director of the International Center for the Rule of Law at the Beijing Normal University, said that passwords are like DNA in cyberspace, and can fulfill security requirements such as identity anti-counterfeiting, information leakage prevention and content tampering prevention in the cyber world. Blockchain technology will encrypt the privacy protection protocol in various ways. As the core algorithm of blockchain technology, a variety of cryptographic technologies provide functions such as identity authentication, data verification, privacy protection, and fair incentives. The key guarantee for the safe operation of blockchain technology.