Which list below includes only items that would be expected to be included in a block header?Merkle root of transactions, difficulty, timestamptimestamp, transaction data, noncenonce, difficulty, hash of next blockO fees, Merkle root of transactions, timestamptransaction data, fees, timestampTheoretically, what percentage of mining power is needed by an attacker in order for them to expect a selfishmining attack to be successful?31%O 519%33%66%

Solution 1 A block header is used to identify a specific block on a blockchain and is periodically…

Which list below includes only items that would be expected to be included in a block header? O Merkle root of transactions, difficulty, timestamp timestamp, transaction data, nonce O nonce, difficulty, hash of next block fees, Merkle root of transactions, timestamp O transaction data, fees, timestamp Theoretically, what percentage of mining power is needed by an attacker in order for them to expect a selfish mining attack to be successful? O 31% O 5196 O 33% 66%

Which list below includes only items that would be expected to be included in a block header? O Merkle root of transactions, difficulty, timestamp timestamp, transaction data, nonce O nonce, difficulty, hash of next block fees, Merkle root of transactions, timestamp O transaction data, fees, timestamp Theoretically, what percentage of mining power is needed by an attacker in order for them to expect a selfish mining attack to be successful? O 31% O 5196 O 33% 66%

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

See similar textbooks

Similar questions

Please send me answer within 10 min!! I will rate you good for sure!! Please explain the answer in your own word!! How could a second hash value (such as SHA256, in this case) help to verify the integrity of the download? Explain.
Which of the following statements about Anonymity is CORRECT: A. Bitcoin is anonymous as it doesn't use any name at all. B. In the Bitcoin network, you can only create a limited number of addresses. C. Unlinkability means that if a user interacts with the system repeatedly, these different interactions should not be able to be tied to each other from the point of view of the adversary. D. The anonymity set of your transaction is the set of transactions without real identities.
Which of the following statements about Bitcoin miners is CORRECT: A. To be a Bitcoin miner, you don't have to join the Bitcoin network. B. In the Bitcoin network, there is a blockchain where each block header points to the NEXT block header in the chain. C. In the blockchain, within each block there’s a Merkle tree of all of the transactions included in that block. D. The mining difficulty in the Bitcoin network is never changed.
1-What kind of attack makes the Caesar cipher virtually unusable? Escrow attack Man-in-the-middle attack Transposition attack Frequency Analysis 2-When an attacker is using a brute force attack to break a password, what are they doing? Trying to recover the key without breaking the encryption. Looking at the hash values and comparing it to thousands or millions of pre-calculated hashes. Looking at common letter frequency to guess the plaintext. 4. Trying every possible key to, over time, break any encryption
What type of authentication method is displayed in this picture? Multi-Factor Authentication Biometric Authentication Token-based authentication Single Sign-on 2.Wendy is examining the logs of a web server that was compromised by a remote attacker. She notices that right before the attack, the logs show a series of segmentation fault errors. Other logs indicate that the attacker sent very long input strings to the web server that had malicious commands at the end of the string. What type of attack most likely took place? SQL Injection Cross-site request forgery Cross-Site scripting Buffer Overflow 3.Jessica is combatting a security incident where a specific piece of malware is continually infecting systems on her network. She would like to use application control technology to block this file. What type of application control should she use? Greylisting Bluelisting Whitelisting Blacklisting
Which of the following statements about tokens is FALSE? Ethereum tokens, whether they’re ERC20-compliant or not, are handled through smart contracts The same token can exist on different blockchains An ERC20 token is dependent on the Ethereum blockchain All token are fungible, and must be tradeable without losing value
In a few sentences, describe how an RSA keypair is generated. Make sure to describe which values are part of the public key and which values are part of the private key.
q3B- Bob has set up a website to collect donations for his new sponge. Alice has decided to donate money to Bob’s sponge and submitted a transaction with her financial details and a donation sum of $10. The financial transaction has been altered before reaching it to the server, and the donation sum was changed to $100. Q- Which CIA element(s) was/were targeted by the threat and why do you think so?
MAX is the security administrator for an administrator for an organization that uses a remote access VPN. The VPN depends upon RADIUS authentication, and MAX would like to assess the security of that serivce. Which one of the following hash functions is the strongest cryptographic hash protocol support by RADIUS?
Which encryption benchmark ensures data is not modified after it’s transmitted and before it’s received? a. Confidentiality b. Integrity c. Availability d. Symmetric
Which of these can be used to defend against some types of client attacks on a password system (note: the system must remain a user-knowledge-based authentication system)? Select one: a. Hash the passwords and store the hashes, rather than the plaintext passwords b. Store the password on a physical object c. Use one-time passcodes d. Limit the number of login attempts allowed
Please answer all parts of the question 2. For the given plaintext: “thechildrenlearntocipherandsing” and cipher mentionedbelow, find the ciphertext: a. Key = 5 for Rail Fence cipherb. Key = 4 (number of rows) for Transposition cipherc. Key = 3 for Rail Fence cipherd. Cipher text is circular shift RIGHT by 2 positions• For example: circular shift right by 1 position: leftmost bit in the ciphertextis the same as rightmost bit in the plaintexte. Cipher text is logical shift left by 2 positions• Logical shift left by 1 position: Rightmost bit becomes ‘0’.