Suppose we want to send the same message several times using secret-key cryptogr

Question

Suppose we want to send the same message several times using secret-key cryptography (e.g., 3DES), in codebook block cipher mode. Assume that we don’t want to change keys only rarely. 1) Find a method that prevents eavesdroppers from seeing that the same messages are sent repeatedly. Assume here that the number of repetitions of the same message are small (e.g., < 20). 2) The question is as in 1, but assume now that we can repeat the same messages very often. Recall that we use a codebook block cipher. Your method for 1 should be more efficient than the one for 2 and Why would block chaining and cipher feedback make question 2.2 easier? please also explain in words

Explanation / Answer

In our case we are using the secret key cryptography, in which same secret key is being used for encryption as well as for decryption. That is why Secret key cryptography is more prone to eavesdropping. As in our given scenario we don't want to change the keys very often, so its very important to use the HTTPS encrypted connections to send the same message repeatedly.
It will surely prevent the eavesdropper from reading and accessing the content of message.

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