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端口掃描與檢測(cè)技術(shù)的實(shí)現(xiàn)—免費(fèi)畢業(yè)設(shè)計(jì)論文-資料下載頁(yè)

2024-12-01 15:37本頁(yè)面

【導(dǎo)讀】隨著Inter日益廣泛的應(yīng)用,黑客攻擊行為也是有增無(wú)減。抵御這種攻擊行為,一直是信息安全領(lǐng)域的焦點(diǎn)。而其中,端口掃描技術(shù)吸引了越來(lái)越多人的關(guān)注。端口掃描是黑客搜集目。標(biāo)主機(jī)信息的一種常用方法。為了有效地對(duì)付網(wǎng)絡(luò)入侵行為,對(duì)端口掃描進(jìn)行研。究是非常有益和必要的。攻擊者在攻擊一個(gè)目標(biāo)時(shí),首先要獲取目標(biāo)的一些基。開(kāi)放的端口,從而確定目標(biāo)機(jī)器中提供的服務(wù),為下一步攻擊做準(zhǔn)備。描和檢測(cè)技術(shù)作了演示及分析。

  

【正文】 them, the waterfront, even boats in the harbour。 yet, waking, I had never seen the sea, or a boat. ... And the buildings were quite unlike any I knew. The traffic in the streets was strange, carts running with no horses to pull them。 and sometimes there were things in the sky, shiny fishshaped things that certainly were not birds. Most often I would see this wonderful place by daylight, but occasionally it was by night when the lights lay like strings of glowworms along the shore, and a few of them seemed to be sparks drifting on the water, or in the air. It was a beautiful, fascinating place, and once, when I was still young enough to know no better, I asked my eldest sister, Mary, where this lovely city could be. She shook her head, and told me that there was no such place — not now. But, perhaps, she suggested, I could somehow be dreaming about times long ago. Dreams were funny things, and there was no accounting for them。 so it might be that w hat I was seeing was a bit of the world as it had been once upon a time — the w onderful world that the O ld People had lived in。 as it had been before God sent Tribulation. 第 24 頁(yè) 共 23 頁(yè) But after that she went on to warn me very seriously not to mention it to anyone else。 other people, as far as she knew, did not have such pictures in their heads, either sleeping or wa king, so it would be unwise to mention them. That was good advice, and luc kily I had the sense to ta ke it. People in our district had a very sharp eye for the odd, or the unusual, so that even my lefthandedness caused slight disap proval. So, at that time, and for some years afterwards, I did not mention it to anyone — indeed, I almost fot about it, for as I grew older the dream came less frequently, and then very rarely. But the advice stuc k. Without it I might have mentioned the curious understanding I had w ith my cousin Rosalind, and that would certainly have led us both into very grave trouble — if anyone had happened to believe me. Neither I nor she, I think, paid much attention to it at that time : we simply had the habit of caution. I certainly did not feel u nusual. I was a normal little boy, growing up in a normal way, taking the ways of the world about me for granted. And I kept on like that until the day I met Sophie. Even then, the difference was not immediate. It is hindsight that enables me to fix that as the day when my first small doubts started to germinate. That day I had gone off by myself, as I often did. I was, I suppose, nearly ten years old. My next sister, Sarah, was five ye ars older, and the gap meant that I played a great deal alone. I had made my way down the carttrack to the south, along the borders of several fields until I came to the high bank, and then along the top of the bank for quite a way. The bank was no puzzle to me then: it was far too big for me to think of as a thing that men could have built, nor had it ever occurred to me to connect it with the w ondrous doings of the Old People whom I sometimes heard about. It was simply the bank, ing round in a wide curve, and then running straight as an ar row towards the distant hills。 just a part of the world, and no more to be wondered at than the river, the sky, or the hills themselves. I had often gone along the top of it, but seldom explored on the farther side. For some reason I regarded the country there a s foreign — not so much hostile, as outside my territory. But there was a place I had discovered where the rain, in running dow n the far side of the bank, had worn a sandy gully. If one sa t in the start of that and gave a good push off, one could go swishing down at a fine speed, and finally fly a few feet through the air to land in a pile of soft sand at the bottom. I must have been there half a dozen times before, and there had never been anyone about, but on this occasion, when I was pic king myself up after my third descent and preparing for a fourth, a voice said: 39。 Hullo!39。 I looked round. At first I could not tell where it came from。 then a shaking of the top twigs in a bunch of bushes caught my eye. The branches parted, and a face looked out at me. It was a small face, sunburned, and clustered about by dark curls. The expression was somewhat serious, but the eyes sparkled. We regarded one another for a moment, then: 39。Hallo,39。 I responded. She hesitated, then pushed the bushes farther apart. I saw a girl a little shorter than I wa s, and perhaps a little younger. She wore reddishbrown dungarees with a yellow shirt. T he cross stitched to the front of the dungarees was of a dar ker brown material. Her hair was tied on e ither side of her head with yellow ribbon s. She stood still for a few seconds as though uncertain about leaving the security of the bushes, then curiosity got the better of her caution, and she stepped out. I stared at her because she was pletely a stranger. From time to time there were gatherings or parties w hich br ought together all the children for miles around, so that it was astonishing to encounter one that I had never seen before. A grain of sand, teetering on the brink of the pit, trembled and fell in。 the ant lion at the bottom angrily flung it out aga in. For a moment there was quiet. T hen the entire pit, and a square meter of sand around it, shifted drunkenly while two coconut palms bent to watch. The sand rose, pivoting at one edge, and the scarre d head of a boy appeareda stubble of brow n hair threatened to erase the marks of the sutures。 with dilated eyes hypnotically dark he paused, his neck just w here the ant lion39。s had been。 then, as though goaded from below, he vaulted up and onto the beach, turned, and kic ked sand into the dar k hatchway from which he had emerged. It slammed shut. The boy was about fourteen. For a time he squatted, pushing the sand aside and trying to find the door. A few centi
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