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Before performing an SSL data transfer, Both sides of the communication must first shake hands with SSL, The encryption algorithm has been negotiated to exchange the encryption key, Perform identity authentication, Normally, This SSl handshake process only needs to be performed once, But there is a Regegotiation option in the SSL protocol, It allows renegotiation of the secret key to create a new key, The attacker repeatedly carries out the key renegotiation process, and the key renegotiation process requires the server to invest 15 times more CPU computing resources than the client. In addition, even if the server does not support Renegotiation, the attacker can still create similar attack effects by opening a new SSL connection separately.Button in Jump-Unrivaled Flurry in the Air: After pressing the button in Jump, it becomes unrivaled flurry in the air.If I were to implement a pizza ordering system, I would definitely write the code like this, because this kind of code can be written subconsciously without consuming our brains. However, take a closer look at this code: the purpose of this method is to order pizza. However, the code for ordering pizza also needs knowledge about the production of pizza. This method must know all pizza. Worse still, if the types of pizza are to be expanded or pizza with poor sales volume are to be deleted in the future, then the code for ordering pizza will be modified. It looks very bad and should be revised. Our first step must be to separate the code for producing Pizza from the code for ordering pizza, because you should not let the code for ordering Pizza know the logic for producing pizza, but should hand over the logic for producing Pizza to a special type. In this way, we can cope with future changes-if we want to add or delete pizza, we can directly modify the producer of pizza without affecting the logic of ordering pizza.　　一切似乎不止是水管漏水那么简单，怪异的事情接连发生，房间似乎有了自己的生命，一心想找出真相、保护自己深爱的女儿的达莉娅不知不觉陷入了更深In practice, we often see some of the most advanced groups of spammers trying to derail Gmail filters by reporting a large amount of spam as non-spam. As shown in the figure, from the end of November 2017 to the beginning of 2018, there were at least four large-scale malicious actions trying to distort our classifier.9-3 User: Create a class named User, which contains the attributes first_name and last_name, as well as several other attributes that the user profile usually stores. Define a method named describe_user () in the class User, which prints a summary of user information; Then define a method called greet_user (), which sends personalized greetings to users.(5) A photocopy of the capital verification certificate, the certificate of ownership of the place, and a list of major instruments, equipment and facilities;