Final Project Specifications and DemoDesign a digital system, using Logisim, for encryption$-$decryption using a $7$ bit toy$-$key with the following

functionality:

$1.$ Use the Logisim Keyboard $($which interfaces with your laptop keyboard$)$ to write text. Text will be

displayed in four TTY Logisim displays.

$2.$ In the first display you will display the text as it is typed in the keyboard.

$3.$ In the second display you will display the encrypted text delivered by the Encryption Sub$-$system using a $7$

bit toy$-$key. The encryption method using the $7$ bit key is your decision. The $7$ bits in your key will be used,

somehow, to change the original $7$ bits of each character. The change should be reversible at the

decoding stage. Hint: There are only $128$ possible combinations of $7$ bits, therefore is very easy to crack

the encryption resulting from a single $7$ bit toy$-$key if you know the encryption method.

$4.$ In the third display you will display the text decrypted by your client, using the client decryption sub

system, at the other end of the channel. You client knows the encryption method and also knows the

encryption key.

$5.$ In the fourth display you will display the text decrypted by the Hacker, using the Hacker Key Search and

Hacker Decryption sub$-$systems. The hacker knows the encryption method but not the $7-$bit encryption

key.

$6.$ Constraints: Spaces are not encrypted. You should check the $7$ bit representation of a space and

somehow you should leave it unchanged when it appears in the channel. When there are no characters in

the channel the decryption displays are also frozen. Use type$-$D flip flops if needed.

$7.$ You may use built$-$in Logisim blocks if desired $($Such as Counters and Registers$).$

$8.$ Hacker applies each possible $7-$bit key and until text becomes intelligibly.

$9.$ Each key that the Hacker applies should be tried on two to three words or about $20$ characters $($enough to

see a pattern of intelligibly text$).$ Hint: Therefore the clock for the circuit that produces each Key for the

Hacker should be slower than the system clock $($Look for information regarding clock division$).$

$10.$ When text becomes intelligibly hacker stops the search and retains the working key.

I need step by step to make the encryption circuit in logisim$.$

I need to see the drawing of the complete circuit.