- We consider a DES-based encryption scheme, which operates on 8 bit blocks of plaintext and uses sub-key of length 12. A sketch of the encryption with first-round is given in the figure.

- Describe L1 and R1 with respect to R0, L0 and K1.

- Consider the following bit sequence as the input data: 11010010, and the cipher function f is as described in S-DES

- Write down L1 and R1 as a bit sequence

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