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According to statistics, SYN attack is the most common and easily used attack method among all hacker attacks. I believe many people still remember the attack on YAHOO website in 2000. At that time, hackers used simple and effective SYN attacks. Some network worms cooperated with SYN attacks to cause greater damage. This paper introduces the basic principle, tools and detection methods of SYN attack, and comprehensively discusses the prevention technology of SYN attack.金明洙饰演初精英原则主义法官“林巴伦”一角，他是以高分考取名牌大学法学系、独来独往的法院个人主义者法官。虽是精英中的精英，却对晋升没兴趣，对任何事都很冷淡，只按原则办事，认为以个人的同情心和善意来判断是滥用职权。　　至于得奖人未能在颁奖礼上接受同业掌声，尔冬升坦言遗憾，不过承诺将于明年第40届金像奖举行前，“补回”颁奖礼弥补缺陷，但详情要待疫情过后才可落实。他附身于一位刚过世的富翁继承人，并且利用冥差赋予他的异能帮助各种灵魂完成未了之心愿，以证明他确实应该继续活着。In order to use SYN? Cookies to calculate the SYN-ACK serial number (that is, SYN? Cookies), the host must first combine some local password bits, a data structure including IP address and TCP port number, SYN initial sequence number, and some index data identifying the password bits. An MD5 digest is generated on top of all the above bytes, and then some bits are truncated from the hash value to put it into the SYN-ACK sequence number. Since the size of the sequence number is about a quarter of the total hash value, this truncation is necessary, but usually at least 3 bytes of hash bits are used for verification, which means that there are still nearly 2 24 possibilities to guess and verify cookies without knowing the password bits. In order to send out the hash value, some bits of cookies will reduce the upper limit value of MSS (Maximum Segment Length) contained in SYN and affect the index bits that identify the native password bits in the hash value.对上抱拳道：下官没来之前，觉得这陈离怕是假的。