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The Mutual Information Analysis (MIA) is a generic side channel distingui she that has been introduced at CHES 2008. This paper brings three contributions with respect to its applicability to practice. First, we emphasize that the MIA principle can be seen as a toolbox in which different (more or less effective) statistical methods can be plugged in. Doing this, we introduce interesting altematives to the original proposal. Second, we discuss the contexts in which the MIA can lead to successful key recoveries with lower data complexity than classical attacks such as, eg. using Pearson's correlation coefficient. We show that such contexts exist in practically meaningful situations and analyze them statistically. Finally, we study the connections and differences between the MIA and a framework for the analysis of side- channel key recovery published at Eurocrypt 2009. We show that the MIA can be used to compare two leaking devices only if the discrete models used by an adversary to mount an attack perfectly correspond to the physical leakages.
忽略文中的数字和符号，试用(1.9)仿射密码加密。然后对密文进行破密。
housands of runners participate every year.
A)Therefore B)Furthermore C)Accordingly D)Nevertheless
We have read your advertisement in International Trade and are glad to know that you are one of the leading exporters of silk blouses (短上衣，女衬衫)in China. We are interested in the goods and would like to be informed of the details of your various types, including sizes, colors and prices.
We are a large dealer in silk garments(服装), having over 15 years’ experience in this particular line of business. Silk blouses of good quality and moderate prices command a good sale in our market.
When replying, please state the terms of payment and the discounts you would allow on a regular purchase of over 100 dozen items.
We look forward to your early reply.
Yours sincerely,
D. Johnson
Letter Two
April 20, 2019
Dear Sir,
We are pleased to receive you inquiry of April 10 , and thank you for your interest in our products.
We are glad to tell you that we are in a position to supply the items inquired. We are confident that the superior material and exquisite(精致的)craftsmanship of our silk blouses appeal to the most selective buyers.
On regular purchases of over 100 dozen items a discount of 3% is granted. If you place your order no later than the end of this week, we would guarantee a prompt delivery within 20 days, and demand you payment by sight L/C.
Enclosed is a quotation sheet and a copy of illustrated catalogue giving the details you ask for. As the market is showing an upward tendency, it is profitable for you to place an order immediately.
We look forward to your early reply.
Yours sincerely,
D. Johnson
Letter Two
April 20, 2019
Dear Sir,
We are pleased to receive you inquiry of April 10 , and thank you for your interest in our products.
We are glad to tell you that we are in a position to supply the items inquired. We are confident that the superior material and exquisite(精致的)craftsmanship of our silk blouses appeal to the most selective buyers.
On regular purchases of over 100 dozen items a discount of 3% is granted. If you place your order no later than the end of this week, we would guarantee a prompt delivery within 20 days, and demand you payment by sight L/C.
Enclosed is a quotation sheet and a copy of illustrated catalogue giving the details you ask for. As the market is showing an upward tendency, it is profitable for you to place an order immediately.
We look forward to your first order.
Yours faithfully
Wang Fan
B-16. According to the passage, the buyer wants to purchase _____.
A、100 dozen silk blouses
B、less than 100 dozen silk blouses
C、over 100 dozen blouses
D、over 100 dozen items of silk blouses
B17. Which of the following statements is true？
A、It is the first time that the buyer contacts the seller.
B、The buyer has over 100 years’ experience in this line of business.
C、The seller has read the buyer’s advertisement in International Trade.
D、The buyer is one of the leading exporters of silk blouses in China.
B-18. When did the seller write the letter？
A、On April 10, 2019.
B、On April 20, 2019.
C、On April 19, 2019.
D、Yesterday.
B-19. On what condition does the seller allow a discount of 3%？
A、To buy 100 dozen silk blouses.
B、To buy over 100 dozen silk blouses.
C、To buy regularly over 100 dozen blouses.
D、To buy regularly over 100 dozen items of silk blouses.
B-20. What is put into the envelope with Letter Two？
A、Not mentioned.
B、Some samples.
C、A quotation sheet and a copy of illustrated catalogue.
D、A guarantee letter.
don, at least ten priceless paintings were completely destroyed.
(A) broke off (C) broke down
(B) broke out (D) broke up
in London, at least ten priceless paintings were completely destroyed.
(A) broke off (C) broke down
(B) broke out (D) broke up
When Reginald Lindsay received a scholarship to Morehouse College in Atlanta, Georgia, what he wanted most was a good job with a good salary. But soon he became interested in the civil rights movement. At present he has a plan which he hopes will take him to Congress as a southern representative.Now in his first year at Harvard Law School, Reg is making careful plans. After earning his degree, he expects to return to the South to practice law among the poor. "I want to help them understand what their rights are and to help them achieve them," he says. Then he hopes to run for political office at the local and state level until he is ready to try for Congress.Reg grew up in a low-income Negro section of Birmingham, Alabama. Brought up by his grandparents after his parents were divorced while he was very young, Reg has been living through a period of far-reaching progress in race relations. In the summer of 1968 Reg himself became a good example of this progress when he became the first Negro student appointed to a special new program. The program introduces bright young students to the workings of the Georgia State government and encourages them to seek employment there after finishing their education. "I've been lucky," he says. "I seem to have been in the right place at the right time."
But luck is only part of Reg's story, for he has made the most of opportunities that came his way. He learned to read in kindergarten and began visiting the public library regularly to borrow books. His grandparents encouraged him, though neither of them had much education, and they bought him a set of encyclopedias. "I loved those books," he re- members. "I used to come downstairs before breakfast and read short articles. I enjoyed reading about famous men, and then I would pretend to be one of them. I guess it was partly a childish game and partly an escape. It wasn't too much fun to be a Negro when I was a kid."
While studying for his bachelor's degree at Morehouse College, Reg worked on several political campaigns helping candidates get elected to government offices. At the same time he maintained a "B" average while majoring in political science. He worked as a student advisor to earn extra money for his college expenses, and he was granted a scholarship for a year of study at the University of Valencia in Spain.With just two more years to complete at Harvard Law School, which also gave him a scholarship, Reg has made a good start on his professional career. He says, "The good life for me is the kind of life where I can find satisfaction in public service."
1.When Mr. Lindsay received a scholarship to Morehouse College, he wanted to ____
A、become a southern representative in Congress
B、participate in the civil rights movement
C、get a good job with good pay
D、help candidates get elected to government office
2.We learn from the passage that Lindsay ____
A、spent his childhood with his grandparents
B、loved to read history books
C、had well-educated grandparents
D、learned to read after his parents divorced
3.Lindsay felt that ____
A、reading about famous men would help him to succeed
B、pretending to be a famous person was a way to escape from the realities of life
C、reading in the public library was a good way to educate himself
D、reading widely would provide him with many opportunities in the future
4.In Lindsay's time, ____ .
A、there was a great improvement in race relations
B、black people were still looked down upon
C、the Georgia State government encouraged black students to work for it
D、it was impossible for blacks to enter famous universities
5.According to the passage, Lindsay's purpose in life was to ____
A、become a famous lawyer
B、be elected to political office at the local level
C、get another scholarship to study abroad
D、serve the public
【题目描述】
第59题：When a fire ________ at the National Exhibition in London, at least ten priceless paintings were completely destroyed. A) broke off
B) broke out
C) broke down
D) broke up
| 【我提交的答案】： B |
| 【参考答案与解析】： 正确答案：B |
【我的疑问】（如下，请求专家帮助解答）
break off 是什么意思？
Within two weeks of arrival, all foreigners had to ___ with the local police.
A)inquire B) consult C) register D) resolve
red rockets and missiles at military _____in the coastal city.
A)goals B)aims C)targets D)destinations
A.It
B. As
C.That
D.What
