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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.本片是周润发早期英雄片的代表作之一。一夜，一名警官在搜查红灯区时，却意外遭枪击身亡，警局高层意识到了这里潜藏着一班不寻常的匪徒。刘帮办联系上了警局一直部署在江湖的卧底，也是他的外甥――高秋(周润发 饰)，要他尽快打入这帮匪徒的内部，获知他们的犯罪计划。 高秋化身作枪械贩子，和匪首南哥与他的手下阿虎（李修贤 饰）取得了联系。刘帮办恐自己的外甥出意外，派人暗中跟踪。不料歪打正着反而因为警方的派人跟踪令高秋顺利取得了匪帮的信任，南哥正式拉高秋一起加入他们的抢劫金铺的计划。在与阿虎的点滴接触中，高秋发现自己与他逐渐建立了兄弟情谊。一边是兄弟情谊，一边是社会公义，高秋将如何取舍?新年期间马上就要结束了，大家抓紧吃好玩好。这已经不是挑衅了，而是威压，抓住你的心理短板大举施压。张槐点头道：这主意好。In real life, observer mode can be seen everywhere, for example, subscribing to parade numbers in WeChat, subscribing to blogs and paying attention to friends in QQ microblog, all of which belong to the application of observer mode.