Decrypt the ciphertext 101000111001 which was encrypted with the

Question

Decrypt the ciphertext 101000111001 which was encrypted with the Toy block cipher once using the key 101010010. Show all the steps.
b) A 64 bit key for the DES is given below
$\quad$ 11000111 $\quad$ 10000101
$\quad$ 11110111 $\quad$ 11000001
$\quad$ 11111011 $\quad$ 10101011
$\quad$ 10011101 $\quad$ 10010001
$\quad$ i) Check whether the key is error free using the parity bits.

09 Jan 2026

Answer :

Word Count : 323

For part (a), decrypting the ciphertext using the Toy block cipher: Ciphertext: `101000111001` Key: `101010010` Step 1: Split the ciphertext into blocks The Toy block cipher typically uses 6-bit blocks. So: `101000` | `111001` Step 2: Apply the key Toy block cipher decryption usually involves XORing the ciphertext with the key (or subkeys _________ ___ ______ _________ ________ ____ ____.
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