According to the Shenzhen Overseas Chinese News, Whitfield Diffie, who is known as the "father of modern cryptography" and "the founder of world cybersecurity", said that there is no cyber security in the second session of the Shenzhen-based overseas talents in Shenzhen. Without a stable economic and social normal operation, the interests of the public cannot be guaranteed. The core support behind the extremely hot blockchain is public key cryptography. He also pointed out that the blockchain will have a larger user base in the future, and the prospect of the blockchain depends on whether it can create value for users. At the same time, the development of blockchain has promoted the “revival” of encryption technology to a certain extent, so that the blockchain refocuses on the encryption level of products.