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- Let A = {a, b, c}, B = {x, y}, and C = {0, 1}. Identify B × B × B.Question 15 For Questions 15.1 - 15.2 consider the following integers: In a RSA cryptosystem with public- key (3233, 59), compute: 15.1 the private-key and give you final answer as an ordered pair (n, d).Elgamal Signature Scheme: Given the following table describing the procedure for Alice to send a signed message with Elgamal signature to Bob, calculate the unknown entities and verify that Bob has received the correct message sent by Alice. Alice Bob Chooses p=23 Chooses a primitive element α=5 Choose a random integer d=4 Compute β = αd mod p = Public key is kpub = (p, α, β) = Private key is kpr = d = Send Public key kpub = (p, α, β) to Bob: Receives Alice’s public key kpub = (p, α, β)= Choose an ephemeral key KE = 7 Message to send is m=8 Computes signatures (s,r) for m r= αKE mod p = Compute KE-1 mod (p-1) s= (m-d*r)* KE-1 mod (p-1) = Send (m, (r,s)) to Bob: Receives (m, (r,s)) = Compute t = βr * rs mod p = Verifies if t = αm mod p =
- 2 1 3 4 5 6 7 8 hot true yes hot false no mild true no cold false yes cold false yes mild false yes hot true no hot false yes Suppose you are building a classifier model using the 1R algorithm we discussed. Which of the following is closest to the error rate of attribute A22 O a. 0.25 b. 0.413 c. 0.375 O d. 0.733Select each correct statement. If a cryptographic hash function is preimage resistant, then it is collision resistant. HMAC uses almost-universal hashing to produce an authentication tag. Wegman-Carter authentication uses a cryptographic hash to produce an authentication tag. If a cryptographic hash function is collision resistant, then it is preimage resistant. Fast cryptographic hashes are faster than fast almost-universal hashes.Suppose Alice used a Hash function HA to encrypted her sensitive data. Everyone in the public can access her encrypted data. Group of answer choices She must keep HA secret and should not share it with others. She can share HA with other users. She must keep HA secret but can share it with others after encryption. None of the above.
- referring to Diffie Hellman, if the prime q is 353, alpha is 5, random secret key Xa is 110 and random secret key Xb is 92, then the public key would be:What is the difference between a binary semaphore and a counting semaphore? Question 9 options: A binary semaphore is used for mutual exclusion, while a counting semaphore is used for synchronization. A binary semaphore can only take two values, while a counting semaphore can take any positive integer value. There is no difference between a binary semaphore and a counting semaphore. A binary semaphore is used for synchronization, while a counting semaphore is used for mutual exclusion.Suppose a group of 9 sales price records has been stored as follows: 9, 25, 28, 30, 48, 72, 78, 195, 213 Partition them into three bins then smoothing them by the following methods: Partition into equal-width then smoothing by bin means. Partition into equal-depth then smoothing by bin boundaries.
- Suppose you and your friend would like to use Diffie-Hellman key exchange system to exchange a keyword. Both of you have decided to use the following p = 4138327577, q = 3742197127.If you decide b = 1767005, and your friend has picked a number a that you don’t know. But you havereceived q a mod p from your friend, and the number is 980246808. Find out the common shared key.Schnorr's Zero Knowledge ID. Prime modulus of 9257 and Generator of 17, Alice claims the ID 5117 is hers. She provides a commitment (t) of 7799. We send a challenge (c) of 679 to Alice. She sends a response (s) of 7787. Is she the owner of the ID? What left and right values did we calculate? Question 14 options: 3424 and 3232 1238 and 1230 54354 and 7787 4833 and 4833The most important tables in the library information system are the following. Books (bid, author, title, publisher, year); Members (mid, name, surname, address, telephone); Rental (rid, mid, bid, eid, date); Employee (eid, name, surname, address, telephone) All tables are sorted according to the key. The following information is given. 1 page on the disk = 8KB |Books| = 1.000.000 records, 320 bytes, 25 records/page, 40000 pages |Members| = 10.000 records, 200 bytes, 40 records/page, 250 pages |Rental| = 300.000 records, 40 bytes, 200 records/page, 1500 pages |Employee| = 100 records, 200 bytes, 40 records/page, 3 pages We can have 25.000 pages in the buffer. QUESTION 2.1 B+ index is used on the attribute Books.publisher. The size of the record identifier is 8B, the size of the page identifier is 6B. Calculate the size of the B+ index whose pages are filled to their minimum capacity as accurately as possible. Write down all assumptions.