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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.此时，关口第一道城墙前，一队靖国残兵正在入关，关前值守的兵将验明他们的身份后，才对城墙上守兵示意开城门放他们进去。西汉年间，孤苦无依的孪生姐妹赵飞燕、赵合德二人，流落长安街头以编织草鞋艰难度日。飞燕姐妹因其貌美，被当朝天子汉成帝的表妹阳阿公主收入府中，教习歌舞。汉成帝驾临公主府观赏歌舞，对飞燕的美貌和出色舞技大为倾倒，决意将其带回宫中……第一部的最后，藤丸和其朋友力挽狂澜地阻止了病毒危机。而这次他们面临的则是更加令人恐怖的核弹恐怖计划。在病毒危机结束后两年，受其影响的藤丸决定再也不碰电脑，可是他还是不能组织自己和朋友九条音弥（佐藤健 饰）、高木遥（川岛海荷 饰）被卷入到新的计划当中。载有核弹的飞机正在一点点向东京逼近，而东京的群众却毫不知情，为了避免东京遭受到核弹的重创，藤丸和音弥不得不继续开始奋战。而他们所面对的除了老对手折原玛雅（吉濑美智子 饰）和神崎润（成宫宽贵 饰）外，还有许多新人。而结果究竟如何呢？《致命追踪》讲述的是一个警匪谍战斗智斗勇的故事。卧底警察展昭阳（钱泳辰饰）被指派调查一起毒品制造案。化身为快递员的他在调查过程中遭遇到警匪两方的追捕和围杀，不能亮明身份的他只能依靠自己去破解重重迷索。在这个时候，他的好朋友丁琪（肖茵饰）被牵扯进来，展昭阳既要保护朋友又要躲避两方追杀，经历了多次遇险，甚至被活埋。在他的努力下，毒品案的真相渐渐冒出水面……