5 Questions
What is the purpose of the initial permutation (IP) in the DES algorithm?
To increase the diffusion of the plaintext across the ciphertext
In the example provided, what is the value of the binary string after applying the initial permutation (IP) to the plaintext block?
1100110000000000110011001111111111110000101010101111000010101010
What is the purpose of the 16 rounds of calculation in the DES algorithm?
To provide multiple layers of substitution and permutation operations on the plaintext block
In the example provided, what operation is performed on the output of the Feistel function (f) and the left block of the previous round?
XOR operation
What is the purpose of reversing the order of the two blocks at the end of each round in the DES algorithm?
To prepare for the next round of calculation
Test your knowledge on encrypting each 64-bit block of data using initial permutation, permutation, and other encryption steps. Practice calculating outputs for different permutations and transformations.
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