A is created by using a secure hash function to generate a hash value for a message and then encrypting the hash code with a private key. O Secret key. O Keystream. O One-way hash function. O Digital signature.

Digital signatures have a potential weakness due to lazy users. In e-commerce transactions, a contract might be drawn up and the user asked to sign its SHA-1 hash. If the user does not actually verify that the contract and hash correspond, the user may inadvertently sign a different contract. Suppose that the Mafia try to exploit this weakness to make some money. They set up a pay Web site (e.g., pornography, gambling, etc.) and ask new customers for a credit card number. Then they send over a contract saying that the customer wishes to use their service and pay by credit card and ask the customer to sign it, knowing that most of them will just sign without verifying that the contract and hash agree. Show how the Mafia can buy diamonds from a legitimate Internet jeweler and charge them to unsuspecting customers.

Advances in computing technology which allow for a faster hash rate will provide faster transactions per second.   True ◻ False ◻

16 Which of the following is not one of the encryption functions? A. Hash Coding B. Asymmetric encryption C. Symmetric encryption D. digital envelope

Define hash as it relates to cryptography. Give one example of where a hash algorithm might be used. Name one specific hash algorithm.

Can a hash value be protected such that it may be used for message authentication? Is it possible to attack a MAC technique without discovering the key's ciphertext?

0 Question 23 Which one is used as a "computational infeasible barrier"? O Firewall IDS Access control O Encryption Question 24 A hash collision attack. O Allows a hash to be reversed None of the answers are correct Two messages giving the same hash result Is impossible for a cryptographic hash

which statement best describes how digital signatures work?

What is the purpose of using a hash value to verify a message? In order to exploit a MAC algorithm, do you need to retrieve the secret key?

Unix systems use a hash algorithm to hide passwords. One weakness to this system is the brute force or dictionary attack. To make the system stronger, a added to the entered password before hashing. A/ is