Which of the following is an advantage of using a hash function for message authentication?OptionsThe hash function can be used to generate a random messageThe hash function can be used to verify that the message has not been tampered withThe hash function can be used to encrypt the messageThe hash function can be used to compress the message
Question
Which of the following is an advantage of using a hash function for message authentication?OptionsThe hash function can be used to generate a random messageThe hash function can be used to verify that the message has not been tampered withThe hash function can be used to encrypt the messageThe hash function can be used to compress the message
Solution
The advantage of using a hash function for message authentication is that "The hash function can be used to verify that the message has not been tampered with".
Here's why: A hash function generates a unique output (hash) for a unique input. When a message is sent, a hash of the message is also sent along with it. The receiver, upon receiving the message, applies the same hash function to the received message. If the generated hash matches the received hash, it means the message has not been tampered with during transmission. If the hashes do not match, it indicates that the message was altered.
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Which of the following statements best encapsulates the basic principles of a cryptographic hash function?Group of answer choicesA cryptographic hash function generates a unique identifier for each unique input, can produce output of varying lengths based on the complexity of the input, and maintains a consistent hash value for similar inputs to ensure easy retrieval.A cryptographic hash function is reversible, meaning that with enough computing power, the original input can be retrieved from its hash, and it produces the same hash for any given input of similar size.A cryptographic hash function can easily convert the hash value back to its original input, always produces variable-sized output depending on the length of the input, and a small change in the input results in a minor change in the output hash.A cryptographic hash function is a one-way function that cannot easily be reversed, always produces a fixed-size output regardless of the input size, and a small change in the input results in a drastically different output hash.
Confidentiality: Ensures that sensitive information is accessed only by authorized individuals. Encryption and access controls are commonly used to maintain confidentiality.Integrity: Ensures that information remains accurate and unaltered during transmission or storage. Hash functions, digital signatures, and checksums can be used to maintain integrity.Availability: Ensures that information is accessible and usable when needed by authorized users. This can involve protecting against disruptions such as denial-of-service attacks or hardware failures.
What is the function of a hash function in the creation of a digital signature?a.To encrypt the electronic recordb.To convert the electronic record into a message digestc.To authenticate the identity of the person affixing the digital signatured.To verify the integrity of the electronic recordClear my choice
Your computer system is a participant in an asymmetric cryptography system. You've created a message to send to another user. Before transmission, you hash the message and encrypt the hash using your private key. You then attach this encrypted hash to your message as a digital signature before sending it to the other user.In this example, which protection does the hashing activity provide?answerNon-repudiationConfidentialityIntegrityAvailability
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