Problem: Design an $8-$Bit XOR Encryption Circuit with Key Shifting

Using the knowledge of a one$-$time pad encryption. Design a digital circuit using

registers and combinational logic. The circuit should encrypt an $8-$bit input using an

$8-$bit binary key through XOR operations and provide functionality for cyclic key

shifting.

$($a$)$ Part $1$: Basic Encryption Circuit

Specifications:

i$.$ Inputs:

Data Input: An $8-$bit binary number to be encrypted.

Key Input: An $8-$bit binary key used for the encryption.

Start Signal: A signal that indicates the start of the encryption process.

ii$.$ Encryption Logic:

Implement XOR $($Exclusive OR$)$ operations bit$-$by$-$bit between the Data

Input and the Key Input.

The output should be the $8-$bit result of these XOR operations.

iil. Output:

An $8-$bit encrypted output.

iv$.$ Registers and Storage:

Include registers to store the Data Input, Key Input, and the encrypted

output.

$($b$)$ Part $2$: Key Shifting Enhancement

i$.$ Inputs:

Additional Input $-$ Shift Value:

An integer specifying the number of bits to cyclically shift the Key Input.

The shift can be either left or right, as per your design choice. It does

not have to do both type of shifts, just one.

ii$.$ Modified Encryption Logic:

Before performing the XOR operations, cyclically shift the Key Input by

the specified number of bits.

The shift is cyclical, so the bits should wrap around.

Then proceed with the XOR operations as in Part $1.$

Deliverables:

Provide a detailed circuit diagram for each part.

Clearly indicate the components $($registers$,$ XOR gates, muxes, shift logic$)$ and

their interconnections. You can use D flip$-$flops and muxes without specifying

how they are built, but show all other parts down to the gate level.