8. Justify your answer. [50-100 words] It is necessary to keep cryptographic alg

Question

8. Justify your answer. [50-100 words] It is necessary to keep cryptographic algorithms private. True or False 9. Suppose your spy colleague wanted to send you messages that you could be sure came from him (and not an enemy trying to pretend to be him). What CAIN property is that? Your colleague tells you: “Whenever I send you a message, the last thing in the message will be a number. That number will be a count of the number of letter E’s in the message. If you get a message, and the number at the end is NOT an accurate count of the number of letter E’s, that message is from an imposter.” [a,b,c: 2 points, d: 4 points] a) This number, put at the end of each message, is an example of what cryptographic item? b) Does it have the characteristic of being one way i.e can you deduce the original message? c) Is it collision resistant? d) Can you suggest some other way to indicate that message is from the sender without encryption?

Explanation / Answer

Solution:

The first question is done as per Chegg guidelines, please repost others.

8)

Yes, it is necessary to keep the algorithm private.

Explanation:

Because if the algorithm is not private then it will be easy for an attacker to intercept the message and decrypt the messages since the logic of the encryption strategy is known from the algorithm.

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