PGP encrypt single message for multiple recipients

Question

When i use the @WebListener and @Service in the same class, the methods in the class will run twice. Why is that?

Example code:

@WebListener
@Service
public class WebContextListener implements ServletContextListener {

    private static final Log logger = LogFactory.getLog(WebContextListener.class);


    @Override
    public void contextInitialized(ServletContextEvent sce) {
        ServletContext servletContext = sce.getServletContext();
        logger.info("web listener 启动,为什么会执行两次呢，Spring做了什么处理吗");
        logger.info("web listener runing,why this method ran twice,What did Spring do?");

    }

    @Override
    public void contextDestroyed(ServletContextEvent sce) {

    }
}

Solution

Yes, it's possible – practically all PGP software will let you add multiple recipients when encrypting; no additional configuration is needed.

Comments

[T Wu]

You are right. Thank you for reminding me that I will update the question later. By the way, the framework is Springboot 2.1.3

[vonbrand]

Just to add, what PGP does is generate a key for a symmetric cipher, and cipher that for each recipient with their public key. So the message for many recipients isn't much larger than that for 1.

[Alex]

Is there any technical limit on the number of recpients? Like a whole company of 100 people?

[T Wu]

Thanks for your comment, but I want to know more specific reasons

[doughgle]

So the symmetric key is encrypted for each recipient with their public key. Does each receive a different ciphertext or the same ciphertext with a header length proportional to the number of recipients?

[user1686]

There's one copy of ciphertext and multiple copies of the same symmetric key.