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Decrypt the ciphertext 101000111001 which was encrypted with the Toy block cipher once using the key 101010010. Show all the steps.
The Toy block cipher you're referring to seems to be a simple example for educational purposes. To decrypt a ciphertext using a block cipher, you typically apply the inverse of the encryption steps using ___ ______ _____________ ______ ______ _____________ ________ __.
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Related Question
Alice wants to use the Digital Signature algorithm for signing messages. She chooses p = 83, q = 41, g = 2 and a = 3. Alice wants to sign the message M = 20. She chooses the secret value k = 8. Explain the procedure that Alice will use for computing the signature. What information will she send Bob?
List various concepts, process skills, values, and attitudes that can be developed while teaching the theme of ‘Water’ to Grade 2 children. Also briefly share three activities/strategies you would use to develop these.
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:
Often children are taught counting by making them recite and copy number names in their notebooks. Why is this pedagogy problematic? Discuss the correct way of introducing children to counting.
Apply runs test to the following sequence:
1001101000010000101111011
0111010010110110010011010
0110011100001100100111000
1100001101010111101001110
0010001111000001101010010
1000110100000110100101101
1110001001
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?
Solve the discrete logarithm problem 5x ≡ 22 (mod 47) using Baby-Step, Giant-Step algorithm .
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