畢業設計-rsa公鑰密碼算法的一種快速實現—論文-資料下載頁

【導讀】RSA作為最重要的公開密鑰算法，在各領域的應用數不勝數。法加密速度很慢，難以像其他加密算法那樣得到更廣泛的應用。的速度瓶頸，在全過程中都有使用。本課題將RSA公鑰加密算法用蒙哥馬利算法實現。冪模運算的改進，簡化，提高RSA加密效率。本文主要論述RSA基本原理以及相。加密算法，界面友善，操作方便。RSA公鑰加密算法是第一個既能用于數據加密也能用于數字簽名的算法。易于理解和操作，也十分流行。算法的名字以發明者的姓氏首字母命名：Ron. 雖然自1978年提出以來，RSA的安。隨著越來越多的商業應用和標準化工作，RSA已經成為最具代表性的。VISA、MasterCard、IBM、Microsoft等公司協力制定的安全電

　　

【正文】 pleased her. Extending it, she watched the terminator line crawl around her to bring the hills and valleys of her front into sunlight. Cirocco liked space, reading, and sex, not necessarily in that order. She had never been able to satisfactorily bine all three, but two was not bad. New games were possible in freefall, like the one they had been playing, no hands. T hey could use feet, mouths, knees, or shoulders to position each other . One had to be gentle and careful, but with slow bites and nips anything could be done, and in such an interesting way. All of them came to the hydroponics room from time to time. Ringmaster had seven private rooms, and they were as necessary as oxygen. But even Cirocco39。s cabin was crowded when two people were in it, and it *as at the bottom of the carousel. It took one act of love in freefall to make a bed seem as limiting as the back scat of a Chevrolet. 39。Why don39。t you turn this way a little? Bill asked. Can you give me a good reason? He showed her one, and she gave him a little more than he had asked for. Then she found herself with a little more than she had .asked for, but as usual, he kne would be easy to move it. Cirocco frowned. Just how big is it, then? The PoloAugust, she was almost sure it was August looked at her with that calm, strangely unsettling face. I should say about two or three kilometers. Possibly less. Is that all? Gene grinned. You give me the numbers, I39。ll land on it. What do you mean, 39。Is that all39。? Gaby said. It couldn39。t have been very much bigger, not to have been sighted by the Lunar scopes. We would have known about it thirty years ago. All right. But you interrupted my bath for a damn pebble. It hardly seems worth it. Gaby looked smug. Maybe not to you, but if it was a tenth that size, I39。d still get to name it. Discovering a et or an asteroid is one thing but only a couple people each century ge t to name a moon. Cirocco released her toehold on the holo tank strut and twisted toward the corridor entr The gunner fired the second harpoon. The whale gave a convulsive shudder. His life was nearly over. A life that had begun thirty years ago as a tiny calf in the s parkling Indian Ocean. At the age of f ive he had left his mother and joined other young males in a bachelor group. When his blubber thickened, he migrated to colder waters where food was more plentiful. At 25 he became master of a pod of twelve cows which remained with their calves in tropical seas. Although he was dwarfed by the hundredfoot blue whale, could not sing like the sweetvoiced humpback whaleboth of which fed on planktonhis sort were the largest of the toothed whales, the same majestic breed as Moby Dick. Each year he made the long journey back from the Antarctic to mate. But not this year. For three decades, the bull had eluded harpoons. Now he died, spouting thick blood. The gunner nodded w ith satisfaction. Soon the vast corpse was w inched alongside. Then, swinging slowly, the catcher boat chugged towards the factory ship whose stern gaped open like a mouth to swallow the whale. Once inside, it was hauled up a ramp. The whale was efficiently disposed of. Its domed head yielded fifteen barrels of spermaceti oil for use in cosmetics。 its body, o il for lubricants and leather softening。 its belly, ambergris (the residue of squids39。 beaks) for perfume. Other products w ould later include crayons, candles, soap, pet food, fertiliser, glue. All these could be obtained from vegetable sources. But as long as unscrupulous people paid, whalers would go on breaking the law. Sadly, as he saw the mighty animal disappear, the medical officer walked away. Behind him a helicopter lif ted off with a swish and sw irl of blades. Whale spotting? He wondered, not for the first time, what was really happening aboard the factory ship. Whaling was bad enoughbut he suspected something still more sinister. However, he had learned that it wasn39。t wise to ask too many questions round here. In the Antarctic, you could vanish without trace. Far, far to the north, off the coast of Norway, an oiltanker crawled through fog. Usually the captain loathed such conditions. But today he was pleasedfor the clammy cloud would conceal his activities. Leaning forward on the bridge, he gave orders to wash out the ship39。s tanks. Within minutes a sticky stinking stream of brown liquid was gurgling into the sea. Even when unloaded, a tanker retains about 2,000 tons of oil at the bottom of its tanks. That sludge has to be removed before a new cargo is taken on. Why pay to have the tanks cleaned in port if you could do it for nothing yourself? The captain39。s action was irresponsible, illegal and punishable with a heavy fine. But who can arrest an invisible culprit? He blessed the fog as the ship stole away from the scene of the crime. Hours later a violent storm blew up, clearing the fog. Buffeted by wind, seabirds sought refuge on the calmest waterwhich was those patches slic ked with oil. N ot long after, the first greasecaked casualties started to stagger ashore. Guillemots, gans, puffins, razorbills, little auks, kittiwakes. The final death toll would be fifty thousand. News of the pollution spread fast. People gathered on the beaches, but they were unable to help the birdsexcept by putting them out of the ir misery. As a naturalist explained to a tearful woman onlooker, oil often blinded birds. I t burnt their skin, stomachs and livers. It also removed the waterproofing from their feathers, which insulated them against cold and wet, so they couldn39。t float properly or catch fish. And if the birds weren39。t poisoned by swallowing oil after preening, they would probably die of pneumonia. Singly or in small groups the bedraggled creatures stumbled to land. A threefoot gan, normally brilliant white, pecked feveri