Which of the following types of modifications to a block chain data structure can be detected by someone who holds a hash pointer to the latest block (select all that apply) ? A. Insertion of a block. B. Deletion of a block. C. Re-Ordering of a blocks. D. Tampering of data in a block.
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- Which of the following statements about hash pointers in Blockchain is CORRECT? A. A hash pointer is only used to retrieve the information. B. A hash pointer is only used to verify that the information in the previous block hasn't been changed. C. In the blockchain, the head of the list is a regular hash‐pointer that points to the first data block created in the network. D. In the blockchain, if an attacker tampers a block without modifying other blocks, then we cannot detect the change.Read the bash man or the info page, conduct some experiments, and respond to the following questions. questions: What is the procedure for exporting a function? What is the purpose of the hash builtin? What happens if the exec argument isn't a valid executable?1. Which of the following statements about hash pointers is incorrect: A. A hash pointer gives you a way to retrieve the information. B. A hash pointer gives you a way to verify that the information hasn't been changed. C. In the blockchain, if an attacker tampers a block without modifying other blocks, then we cannot detect the change. D. In the blockchain, the head of the list is a regular hash‐pointer that points to the most recent data block. 2. Which of the following statements about the Merkle tree is incorrect: A. Merkle tree can be considered as a binary tree of hash pointers. B. A node in a Merkle tree can have more than two children. C. In the Merkle tree, it takes O(log n) for the proof of membership, where n is the number of nodes in the tree. D. We can use hash pointers in any pointer‐based data structure as long as the data structure doesn’t have cycles.
- You previously created a file to run a dictionary attack without salt against a target server. The file contains 171000 words from the OED, except the term "impossible." An upgrade to the 32-bit salt server broke the dictionary. You want to build a new dictionary and use it to brute-force an old one. How many dictionaries does the new one have?To test the text-provided implementations of min(), max(), floor(), ceiling(), select(), rank(), deleteMin(), deleteMax(), and keys(), create a test client called TestBinarySearch.java. Initially, use the default indexing client. Add code to accept more command-line arguments if needed.To test the text-provided implementations of min(), max(), floor(), ceiling(), select(), rank(), deleteMin(), deleteMax(), and keys(), create a test client called TestBinarySearch.java. Start by using the default indexing client. Add code to accept extra command-line arguments as needed.
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- Assume you have a text file containing 10,000 words and you want to count the frequency of each word in the file. What is the time complexity of this operation using a hash table?2. Start with an empty buffer pool of size 4 pages again. This time use this access pattern:♯SAGLIKLIMUTLUBAYRAMLAR♯. At the end of accessing all the pattern, what is the content ofthe buffer pool (write in alphabetical order)? Use the LRU algorithm as the buffer replacementpolicy.Can someone explain this code segment to me ? <?phpsession_start();extract($_SESSION);foo($_SESSION["bar"]);echo $bar;function foo($bar) {$bar = 1;};?>