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SYN attack is a kind of DOS attack. It takes advantage of TCP protocol defects and consumes CPU and memory resources by sending a large number of semi-connection requests. SYN attacks can not only affect hosts, but also harm network systems such as routers and firewalls. In fact, SYN attacks can be implemented as long as these systems turn on TCP services no matter what systems are targeted. As can be seen from the above figure, the server receives the connection request (syn=j), adds this information to the unconnected queue, and sends the request packet to the client (syn=k, ack=j+1), then enters the SYN_RECV state. When the server does not receive an acknowledgement packet from the client, it retransmits the request packet and does not delete this entry from the non-connection queue until the timeout. With IP spoofing, SYN attacks can achieve good results, Typically, clients forge a large number of non-existent IP addresses in a short period of time, SYN packets are continuously sent to the server, and the server replies to the confirmation packets and waits for the confirmation of the customer. Since the source address does not exist, the server needs to continuously resend until it timeout. These forged SYN packets will occupy the unconnected queue for a long time, normal SYN requests will be discarded, the target system will run slowly, and in serious cases, the network will be blocked or even the system will be paralyzed.她紧闭嘴唇，神情坚定，心中已经有了算计。Mulder and Scully learn that they aren't the only ones desperately searching for their long-lost son, William. The very fate of the world may depend on the outcome.谁知秦国人也穿着和大楚士卒服饰，难以分辨，以至出现混乱……夏侯婴的话意思很明确，完全就是个误会，人家是一片好心来帮忙的，至于出现意外，办了点错事，并不在考虑之中。发生了战争。与敌对的弗洛斯特共和国的持久战乱……。尽管停战已经过去了三年，但国民的贫困却丝毫没有消除。担心事态发展的军队高层，设立了从饥饿、疫病、野盗化兵等“战争灾难”中复兴出来的部队——陆军情报部第3课。在帝国不稳的状况下，爱丽丝少尉不屈服于贫民的反抗，以贵族的骄傲为目标，为了完成复兴而每天奋斗着。而且，奥兰多伍长拥有神秘秘密部队的所属历，拥有惊人的战斗能力。他心灵深受创伤，在新的环境下，通过和伙伴们的交流，与“战争灾难”对峙，摸索自己应该前进的道路。将覆盖社会的欺瞒和腐败的厚厚的皮撕开，揭露其内在——。This paper summarizes three attack technologies against artificial intelligence systems-antagonistic input, data poisoning attack and model stealing technology. Specific examples and defense strategies are added to the discussion of each attack, aiming at providing an overview for all those who are interested in using artificial intelligence for anti-abuse defense.不过你也说的在理，哪怕能把罪行定的低些，咱们还是要走，但那时就不像这样了，心里没了牵挂，就是无事一身轻了。