【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。為了有效地對付網(wǎng)絡(luò)入侵行為,對端口掃描進(jìn)行研。究是非常有益和必要的。攻擊者在攻擊一個目標(biāo)時，首先要獲取目標(biāo)的一些基。開放的端口，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。描和檢測技術(shù)作了演示及分析。

　　

【正文】 andseek sun of recent wee ks. No, this was the real thing, pure gold pouring out of a perfect sky. She felt the warmth seeping deep into her skin. Slowly the shore floated forward to meet them, or so it seemed. Miami! Without asking, she helped herself to the binoculars hanging round Gary39。s neck. Fumbling, she adjusted the focus. She wanted to see everything. Susan gave a little grunt of pleasure: white sand, palm trees, high hotels whose reflecting w indows signalled like lighthouse s, elegant yachts leaning on the wind and bing creamily through the smooth blue water. Blue! The sea was so blue! Travel brochureblue. Susan gazed in wonder. Could this be the same Atlantic whose grey green waves had made her stomach churn and driven her into her bunk? She handed back Gary39。s binoculars. Both were shading their eyes. The sun shone everywhere, from above and from below, sparking silver on the water, teeming and gleaming like a shoal of surfacing fish ... Warm enough for you? Ben Bellingham stood between them. Temperature39。s in the niies on the m ainland. They chatted for a minute or two. Look, there39。s a pelican. Ben pointed. A brown pelican, quite mon around the Florida c oast. People love watching their antics. The big bird, which reminded Gary of a pterodactyl, was ma king a reconnaissance flight parallel to Sea Shepherd. Suddenly the pelican plunged. A splash, a quic k gobbling movement, and another fat fish was stored away in the bird39。s expandable throat pouch. Pelicans use their elastic bills as scoops, Ben explained. And they vary the height of their dive depending on the depth of the fish. Eat two pounds a day, those fellas, a quarter of their body weight. The bird came in to land on an old jetty. Now it looked clumsy, swaying and teetering down invisible steps to alight on flat webbed feet. Soon after, a dishevelled chick was rummaging in the adult39。s beak. Must have a nest nearby, mented Bellingham. He shook himself. Well, gotta be going. I39。ll see you again before we disembark. By the way, better alter your watchesit39。s 910 local time, five hours behind England. The bearlike naturalist shambled away. To think Susan had once felt shy, almost frightened of meeting him! She sensed, rather than saw, a new presence and peeked sideways. It was Yves. He was draped over the ship39。s rail and looked about as happy as someone being seasick. Why so glum? Susan39。s eyes took in the scene farther along the deck. Ah, that was it. Vanessa. Wearing a polka dot sunsuit that showed off her slender figure and shapely legs. Talking to Johnny Masterson, the handsome heman security officer, in khaki shirt and shorts. Obviously enjoying themselves. Poor Yves! The pelican had resumed its patrol. Susan inched nearer to Yves. Hello, she said lightly. See the pelican? Betcha it ca tches something in a minute? Yves lifted his head. Immediately the pelican obliged with a spectacular swoop. Told you, didn39。t I? Susan chirped. Yves feigned interest, but his face let him down. Susan switched her gaze from the bird to Yves, from Yves to Vanessa, and back to Yves. The pelican flapped off. Never mind, she murmured, there are 第 25 頁 共 23 頁 plenty more fish in the sea. Yao: And I am Yao, king of the rock. And there39。s nothin39。 you girls can do about it. Ling [taking a fighting stance]: Oh, yeah? Well, I think Ping [elbowing Mulan] and I could take you. Mulan [wading away]: I really don39。t want to take him anywhere. Ling [following Mulan]: Ping, we have to fight! Mulan: No we don39。t. [unnaturally] We could just close our eyes and swim around. Ling: C39。mon don39。t be such a gOuch! Something bit me. Mushu [popping out of the water between Mulan and Ling]: What a nasty flavor. Ling [with fear and gusto]: Snake! ChienPo [while all three of them climb up the rock and on each other]: Snake, snake. [Mulan whistles for Khan and wades back to shore. Khan es close enough to shore and Mulan hides behind Khan as she wraps a towelaround her body] [Cut to Yao, Ling and ChienPo calmed down sitting on the rock] Ling: Some king of the rock! [Yao pushes him off the rock] [Cut to Mulan with towel wrapped around her] Mulan: Boy, that was close. Mushu [brushing his teeth]: No, that was vile! You owe me big! Mulan: I never want to see a naked man again. [the rest of the troops run by naked and jump into the lake] Mushu: Hey, don39。t look at me. I ain39。t biting any more butts. [Cut to Mulan outside Chi Fu39。s Tent having dressed fully. Chi Fu and Shang are talking from inside] Chi Fu [fading in]: You think your troops are ready to fight? Hah! They would not last a minute against the Huns. Shang: They pleted their training. Chi Fu: Those *boys* are no more fit to be soldiers than you are to be Captain. Once the general reads my report, your troops will neversee battle. Mushu [from outside the tent]: Oh no you don39。t. I39。ve worked to hard to get Mulan into this war. [to CriKee] This guy39。s messing with myplan. Shang [grabbing onto the front of Chi Fu39。s clip board]: We39。re not finished. Chi Fu [pulling the board away]: Be careful, Captain. The General may be your father, but I am the Emperor39。s council. And, oh, by theway, huh, I got that job on my own. [opens the entrance to the tent for Shang] You39。re dismissed. [Shang storms out of the tent and starts to walk by Mulan] Mulan [in a manly voice]: Hey, I39。ll hold him and you punch, heh, heh... [Shang walks by without reacting] or not. [calling out to Shang] For w hat it39。s worth, I think you39。re a great captain. [Shang pauses to glance back, then continues forward] Mushu [looking at Mulan39。s fixed gaze on Shang]: I saw that! Mulan [innocently]: What? Mushu [teasing]: You like him don39。t you? Mulan: No, I Mushu: Yeah right, Yeah sure. Look, [pointing to Mulan39。s tent