Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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For message authentication, how may a hash value be secured? Can a MAC
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- Bob designed a new scheme to detect whether a message is modified by an attacker (protecting data integrity). The scheme is to append to each message a SHA-256 hash of that message. Explain the vulnerability of Bob’s design.arrow_forwardCan 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?arrow_forwardWhen compared to other families of secure hash functions (such the SHA family of algorithms), what sets a Key Derivation Function apart? To maximize the likelihood of your message's reception, you should include as much specificity as feasible.arrow_forward
- For hash functions, to avoid attacks based on the birthday paradox, it is required to have large number of output bits. Why are shorter length outputs used in MAC?arrow_forwardTo solve the following issue, you must first identify the vulnerabilities in each authentication technique.Passwords are validated by Bob by first hashing them and then looking them up in a database of hashes.Bob uses a hashing method to verify a password against a list of previously hashed passwords.arrow_forwardWhat 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?arrow_forward
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