How is the hash value used for message authentication stored securely? Is it possible to break a MAC without knowing the private key?
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How is the hash value used for message authentication stored securely? Is it possible to break a MAC without knowing the private key?
Step by step
Solved in 3 steps
- How much room does an attacker using a MAC have to tamper with the Tag (the MAC) and the encrypted data? This attack is hopeless since the recipient can always identify whether the Tag/ciphertext has been tampered with.In what ways is the hash value used for message authentication kept secret? Is it possible to break a MAC algorithm even if you don't have the key?How much space does a MAC attacker have to tamper with the Tag (the MAC) and encrypted data? This attack fails because the receiver can always detect altered Tag/ciphertext.
- To what degree may an attacker using a MAC modify the Tag (the MAC) and encrypted data? Because the recipient can always identify whether the Tag/ciphertext has been updated, this attack is bound to fail.How may a hash value be used to authenticate a communication? Is it necessary to retrieve the secret key to exploit a MAC algorithm?How is the hash value of a message used for authentication protected? Is it possible to make use of a MAC algorithm even in the absence of the secret key?
- Do MACs allow attackers to tamper with both the Tag and the encrypted data? Because the receiver can always tell whether the Tag/ciphertext has been tampered with, this attack is useless.How can a hash value be used to authenticate a communication? Is Is it necessary to retrieve the secret key in order to abuse a MAC algorithm?Can a MAC attacker change the Tag and encrypted data? This attack fails because the receiver can always detect altered Tag/ciphertext.
- An attacker may decrypt the ciphertext (message authentication code) by changing the tag or the MAC. Can you identify any issues with this plan? If this attack is successful, the victim may be able to decrypt a modified ciphertext from the original Tag.When using a MAC (message authentication code), what happens if an attacker attempts to change the Tag (MAC) and ciphertext in transit? Explain why this attack will always fail as the recipient can recognize a changed Tag/ciphertext?Is it possible for a MAC (message authentication code) to alter the Tag and ciphertext while they are in transit? Because the receiver can always recognise a modified Tag/ciphertext, this attack will fail.
