【導讀】Linux是一個優(yōu)秀的、開源的操作系統(tǒng)，非常適合作為一些新技術(shù)的。本文修改Linux操作系統(tǒng)內(nèi)核的網(wǎng)絡(luò)協(xié)議，以實現(xiàn)對網(wǎng)絡(luò)通信數(shù)。先介紹了網(wǎng)絡(luò)數(shù)據(jù)加密的發(fā)展和現(xiàn)狀。DES加密算法和Linux下的網(wǎng)際協(xié)議的實現(xiàn)和套接字結(jié)構(gòu)。DES算法，對內(nèi)核進行了修改，添加了一些功能性內(nèi)核模塊。該系統(tǒng)的主要特點。是針對IP地址判斷是否進行加密操作。最后，通過測試驗證了系統(tǒng)設(shè)計的

　　

【正文】 Email： 第 23 頁 共 23 頁 聲 明 本論文的工作是 2020 年 2 月至 2020 年 6 月在成都信息工程學院網(wǎng)絡(luò)工程系完成的。文中除了特別加以標注地方外，不包含他人已經(jīng)發(fā)表或撰寫過的研究成果，也不包 含為獲得成都信息工程學院或其他教學機構(gòu)的學位或證書而使用過的材料。除非另有說明，本文的工作是原始性工作。 關(guān)于學位論文使用權(quán)和研究成果知識產(chǎn)權(quán)的說明： 本人完全了解成都信息工程學院有關(guān)保管使用學位論文的規(guī)定，其中包括： （ 1）學校有權(quán)保管并向有關(guān)部門遞交學位論文的原件與復印件。 （ 2）學?？梢圆捎糜坝?、縮印或其他復制方式保存學位論文。 （ 3）學?？梢詫W術(shù)交流為目的復制、贈送和交換學位論文。 （ 4）學校可允許學位論文被查閱或借閱。 （ 5）學?？梢怨紝W位論文的全部或部分內(nèi)容（保密學位論文在解密后遵守此規(guī)定）。 除非另有科研合同和其他法律文書的制約，本論文的科研成果屬于成都信息工程學院。 特此聲明！ 作者簽名： 2020 年 6 月 日 第 24 頁 共 23 頁 e, Calvin said. Cirocco glanced at him, got a glimpse of his brown eyes before he turned back to his work. That was my thought. A real big fusion ramscoop. The machinery is in the hub, electromagic field generators to funnel the interstellar hydrogen into the center, where it gets burned. Gaby shrugged. Ma kes sense. But what about doc king? Well, leaving the thing would be easy enough. just drop out a hole in the bottom and get escape velocity for free, plus some to fool around with. But there ought to he some sort of dingus that would telescope out to the center of rotation when the engine isn39。t running, to pic k up scout ships. The main engine has to he there. The only other way would be to space engines around the rim. I39。d want three, at least. More would be better. nd gir ls39。 dorms, but you saw everybody in the rec room and the dining hall and so on, and she was in my psychodrama group. Her hair had been black, and shiny as the lacquered furniture in Dr. Hong39。s rooms, her skin white like motherofpearl, her eyes long and narrow (making him think of cats39。 eyes) and dar kly blue. She was fifteen, or so Nicholas believedmaybe sixteen. I39。m going home, she told him. It was psychodrama, and he was her brother, younger than she, and she was already at home。 but when she said this the floating ring of light that gave them the necessary separation from the small doctorandpatient audience, ceased, by i And w hen I was there it rained. There was a big ,39。 trouble at one of the generating piles, and they shut it _ down and it got colder and colder until everybody in the hospital wore their blankets, just like Amerinds in books, and they loc ked the switches off on the heaters in the bathrooms, and the nurses and the screen told you all the time it wasn39。t dangerous, they were just rationing power to keep from blacking out the important stuff that was still running. A nd then it rained, just like on Earth. They said it got so cold the water condensed in the air, and it was like the whole hospital was right under a shower bath. Everybody on the top floor had to e down because it rained right on their beds, and for two nights I had a man in my room with me that had his arm cut off in a machine. But we couldn39。t jump any higher, and it got kind of dark. It doesn39。t always get dark here, Diane said. Sometimes the rain sparkles. I think Dr. Island must do it to cheer everyone up. No, the waves explained, or at least not in the way you mean, Diane. Nicholas was hungry and started to ask them for something to eat, then turned his hunger in against itself, spat on the sand, and was still. es. I never met any one of his class w ho remembered him. They did not even remember that he was middleweight boxing champion. I mistrust all frank and simple people, especially when their stories hold together, and I always had a suspicion that perhaps Robert Cohn had never been middleweight boxing champion, and that perhaps a horse had stepped on his face, or that maybe his mother had been frightened or seen something, or that he had, maybe, bumped into something as a young child, but I finally had somebody verify the story from Spider Kelly. Spider Kelly not only remembered Cohn. He had often wondered what had bee of him. Robert Cohn was a member, through his father, of one of the richest Jewish families in New Yor k, and through his mother of one of the oldest. At the military school where he prepped for Princeton, and played a very good end on the football team, no one had made him raceconscious. No one had ever made him feel he was a Je w, and hence any different from anybody else, until he went to Princeton. He was a nice boy, a friendly boy, and very shy, and it made him bitter. He took it out in boxing, and he came out of Princeton with painful selfconsciousness and the flattened nose, and was married by the first gir l who was nice to him. He was married five years, had three children, lost most of the fifty thousand dollars his fa ther left him, the balance of the estate having gone to his mother, hardened into a rather unattractive mould under domestic unhappiness with a rich wife。 and just w hen he had made up his mind to leave his w if e she left him and went off with a miniaturepainter. As he had been thinking for months about leaving his wife and had not done it because it would be too cruel to deprive her of himself, her departure was a very healthful shock. The divorce was arranged and Robert Cohn went out to the Coast. In California he fell among literary people and, as he still had a little of the fifty thousand left, in a short time he was backing a review of the Arts. The review menced publication in Carmel, California, and finished in Provincetown, Massachusetts. By that time Cohn, who had been regarded purely as an angel, and whose name had appeared on the editorial page merely as a member of the advisory board, had bee the sole editor. It was his money and he discovere d he liked the authority of editing. He was sorry when the magazine became too expensive and he had to give it up. By that time, though, he had other things to worry about. He had be She turned to face the camera. Send me what you can about hydrogen ramscoop engines, she said. See if you can give me some idea of what to look for if Themis has one. You39。ll have to ta