Computers and Technology, 21.02.2020 02:12, elsauceomotho
Bob is launching a new secure messaging app, BobCrypt. When Alice installs the app, it creates an account for her on the BobCrypt server using a hash of her phone number. The app then queries the server by sending the hash of each phone number in Alice's address book to learn which of Alice's friends already have BobCrypt accounts. The goal is that users can discover their friends' accounts without the server learning the contents of every user's address books. Explain why this scheme does not achieve the intended security goal. How can Bob act maliciously to determine the phone numbers and contacts of all BobCrypt users? After you tell Bob that a simple hash is a binding commitment, but does not hide the committed value, he decides to use a common construction for hiding commitments in BobCrypt 2.0. The app now uploads H(phone number, r) where r is a random 128-bit nonce chosen by the app. Explain to Bob why it is not possible to provide the intended functionality using this approach.
Answers: 2
Computers and Technology, 22.06.2019 11:00, paigesyring
How does a policy manual an organization? a. it boost productivity. b. it create awareness in employees about the organization’s values. c. it employees achieve targets. d. it safeguards the organization from liabilities.
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Computers and Technology, 22.06.2019 11:00, lexhorton2002
The great length of north america causes the climate to be varied. true false
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Computers and Technology, 22.06.2019 16:30, sayedaly2096
What type of file does a cookie place on web site visitors' computers so that web site managers can customize their sites to their visitors' preferences?
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Computers and Technology, 22.06.2019 22:00, lgary9462
Perform the following tasks: a. create a class named testclass that holds a single private integer field and a public constructor. the only statement in the constructor is one that displays the message “constructing”. write a main()function that instantiates one object of the testclass. save the file as testclass. cpp in the chapter 08 folder. run the program and observe the results. b. write another main()function that instantiates an array of 10 testclass objects. save the file as test class array. c . run this program and observe the results.
Answers: 1
Bob is launching a new secure messaging app, BobCrypt. When Alice installs the app, it creates an ac...
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