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Question 1:
Jim Doe has been told to design a method by which a message recipient can detect whether received messages have been modified by an attacker while in transit. So he decides to append a hash digest to each message. Why doesn’t this provide data integrity?

Question 2:
Assume a cryptographic algorithm in which the performance for the good guys (the ones that know the key) grows linearly with the length of the key, and for which the only way to break it is a brute-force attack of trying all possible keys. Suppose the performance for the good guys is adequate (e.g., it can encrypt and decrypt as fast as the bits can be transmitted over the wire) at a give key size. Then suppose advances in computer technology make computers twice as fast. Given that both the good guys and the bad guys get faster computers, does this advance in computer speed work to the advantage of the good guys, the bad guys, or does it not make any difference?

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Question 1:
Jim Doe has been told to design a method by which a message recipient can detect whether received messages have been modified by an attacker while in transit. So he decides to append a hash digest to each message. Why doesn’t this provide data integrity?

It is not possible to prevent someone from changing data on the network, but the receiving node must be able to detect whether the data has changed. For this purpose, a message digest or a one-way hash is used. In summary, it is the thumbprint of the summary...

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