Consider the following application scenario: suppose you would like to backup your birthday party video in a cloud, say Google Cloud. During the party, you and some of the friends got drunk, so you don't want anyone you don't know to see the video, moreover, the video le is about 5 Gigabytes. Google's public key is pkG and can be found easily online. We know that public key encryption is exible, but it is computationally expensive, especially on large files. While a symmetric key encryption is simple and e client, however, Google won't be able to share a secret key with its clients. More concretely, a public key encryption on 1Kb data might use less than one second, but if on 5 Gigabytes data, it might take two hours; on the other hand, a symmetric key encryption on 5 Gigabytes still cost only a couple of, say 10 seconds. Describe a possible mechanism with a detailed algorithm description, so that you can use it to upload the 5 Gigabytes video quickly and securely to Google Cloud, taking about only 12 seconds (ignoring the network latency)?

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Instructions: the following argument argues for advertising to children. read the argument and answer the question that follows: topic and question advertising: should companies be allowed to advertise to children? ineffective argument i think that advertising to children is necessary. how else will we know what we can buy? i think that children are not aware of the products that are available. most children don’t own cars and can’t drive to stores to look around. the only way we know what we can buy is by seeing advertisements on tv. my friend really likes advertisements, too. he said, "how will we know what to buy if we don’t see advertisements? " seriously, children are consumers, too. we know what we like and we ask our parents to buy these products for us. i know that i like certain cereals, but how would i know that if i did not see advertisements? i love those commercials! kids are people, too. why is the argument ineffective? in a paragraph of 7–10 complete sentences, explain why the following parts of the argument are ineffective, and how they can be improved: claim support conclusion clincher point of view transitions

Read the excerpt from the diary of a young girl. father finally came home around five o'clock, and we called mr. kleiman to ask if he could come by that evening. mr. van daan left and went to get miep. miep arrived and promised to return later that night, taking with her a bag full of shoes, dresses, jackets, underwear and stockings. after that it was quiet in our apartment; none of us felt like eating. it was still hot, and everything was very strange. which detail from the excerpt reflects the mood of uneasiness and anxiety? “miep arrived and promised to return later that night” “we called mr. kleiman to ask if he could come by that evening” “father finally came home around five o'clock” “it was still hot, and everything was very strange.”