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

8. Justify your answer. [50-100 words] It is necessary to keep cryptographic algorithms private. True or False

Answer)

False. It is not necessary to keep cryptographic algorithms private.

What is means is, when we make something private such as a cryptographic algorithm so that nobody knows how to break it is useless and foolish. Even if the algorithm is great it will have to prove so, by being outright and ensuring the security. If we make a algorithm private that doesn't ensure security, but it's complete blindness from the outside world. Security through obscurity is not security. We also have to test the algorithm's effectiveness by relating it with others and why it is better and also that there should be some standard which the algorithm should follow. The algorithm should handle secrecy, privacy and security on its own, and not that the algorithm itself should be hidden and private.

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