Question
Alice wants to send Bob the message M = 15. She chooses k = 5. How will she compute the cipher text? What information does she send to Bob?
Ah, it seems like Alice is taking a detour into the world of cryptography! In this scenario, Alice is using a basic encryption technique called the Caesar cipher, where she shifts each letter in _____ ___________ _______ ___________ ________ ______ ____________ ________ __ ____________ ____________.
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How would you use an everyday experience from the children’s life to teach them skill of data handling? Discuss with the help of an example.
Find a recurrence that generates the sequence 110110110110110.
Decrypt the ciphertext 101000111001 which was encrypted with the Toy block cipher once using the key 101010010. Show all the steps.
Process Skills
Considering the bytes 10001001 and 10101010 as elements of the field F2[X]/hg(X)i, where g(X) is the polynomial X 8 +X 4 +X 3 +X +1, find their product and quotient .
What do you understand by the term ‘Balance’ in the Balanced Comprehensive Approach to Literacy?
In this exercise, we introduce you to Hill cipher. In this cipher, we convert our message to
numbers, just as in affine cipher. However, instead of encrypting character by character, we
encrypt pairs of characters by multiplying them with an invertible matrix with co-efficients in
Z26.
Here is an example: Suppose we want to ENCRYPT "ALLISWELL". Since we require the
plaintext to have even number of characters, we pad the message with the character ‘X’. We
break up the message into pairs of characters AL, LI, SW, EL and LX. We convert each pair of
characters into a pair elements in Z26 as follows:
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