All documents have DOI numbers. Doi refers to the digital object identifier, which is the best "big data" sample storage and application technology under the background of cloud computing, and is used for the unified distribution of IKE negotiation SA protocol.

The steps are as follows:

1. Open HowNet, enter the keyword of the article you want to search in the search box, and then click Search;

2. Click the title of the paper on the search page to open a Chinese paper;

3. You can see the relevant information of the paper on the paper page. Click on the HTML indicated by the arrow in the figure to read, or you can choose to download the paper.

4, the top is the DOI number of this paper, and the DOI number of general papers will be displayed on the home page.