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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.《火星异种》讲述了在21世纪中期，人类为了让火星变得更加适合居住，将用来改良环境的藻类以及适应性很强的蟑螂投放到了火星上。可是没想到这些生物却拥有了智慧，并且对人类展开了反击。2017-07-22 15:41:20秋子辞去钢琴讲师的工作，目标也没有定下来，每天漫不经心地度过。有一天，姐姐？春子（尾野真千子饰）和家里蹲的弟弟一起紧急招集。为了保护父亲濒临死亡的遗产不受“爱人”的侵害，他们将齐心协力战斗。秋子被卷入姐姐的强势之中，在没有兴趣的情况下，四处奔走，逐渐了解了姐姐和弟弟没有注意到的一面。不久，深更半夜潜入父母家偷了金库…幽默、泪水、温暖包裹着人类的赞歌。杨寿全悠然一叹，他最了解读书的苦，读书的无奈，你做出再多的努力，一旦落空，那种打击，没几个人能受得了。