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 follows a Feistel-like structure with a simple key schedule. Since you haven't specified a precise Toy Block Cipher variant, I'll assume a basic Feistel structure with a 12-bit block and a 9-bit key. We'll proceed step by step. --- ### Step 1: Understand the Cipher Structure - Block Size: 12 bits - Key Size: 9 bits - Encryption Process: The encryption follows a Feistel-like structure with a substitution and permutation. - Decryption Process: ______ ___ ____ ___ _____ _________ _____ _____ _______ ___ _______.
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i) Prepare logarithm and antilogarithm tables as given in page 23 of block 1
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?
a) Decrypt each of the following cipher texts:
i) Text: "CBBGYAEBBFZCFEPXYAEBB", encrypted with affine cipher with key (7,2).
ii) Text:"KSTYZKESLNZUV", encrypted with Vigenère cipher with key "RESULT".
b) A 64 bit key for the DES is given below
i) Check whether the key is error free using the parity bits.
ii) Find the keys for the second round.
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.
a) Decrypt the message c = 23 that was encrypted using RSA algorithm with e = 43 and n = 77.
a) Find the product of
using the algorithm in page 23, block 1. You should show all the steps as in example 11, pag 22, block 1.