1.) Encrypt the hexadecimal message F9E8 using the Rail Fence cipher for binary numbers with 3 Rails. [Give answer in hexadecimal encrypted message]
2.) Decrypt the hexadecimal encrypted message CDEF created by the Rail Fence cipher for binary numbers with 3 Rails. [Give answer in hexadecimal message]
Please identify the School Subject with one of those listed on the upper left.
Sra
Sorry it's computing in security, so I guess that would fall under computers. . .
To encrypt a hexadecimal message using the Rail Fence cipher for binary numbers with 3 rails, follow these steps:
1. Convert the hexadecimal message to binary. In this case, F9E8 converts to 111110011101000.
2. Create the Rail Fence pattern with 3 rails like this:
```
1st rail: / / / / / / / / / / / /
2nd rail: / / / /
3rd rail: / / /
```
3. Arrange the binary message according to the Rail Fence pattern:
```
1st rail: 1 1 1 / / / 0 1 1 1 / 0
2nd rail: / 1 1 1 / 0 0 1 / 0 /
3rd rail: / / / 0 / 1 1 / 0 / /
```
4. Read the binary message row by row: 111011111011001100100001001.
5. Convert the binary encrypted message back to hexadecimal. In this case, the encrypted message is E77191.
Therefore, the hexadecimal encrypted message for the message F9E8 using the Rail Fence cipher for binary numbers with 3 rails is E77191.
To decrypt a hexadecimal encrypted message created by the Rail Fence cipher for binary numbers with 3 rails, follow these steps:
1. Convert the hexadecimal encrypted message to binary. In this case, CDEF converts to 1100111111101110.
2. Create the Rail Fence pattern with 3 rails like this:
```
1st rail: / / / / / / / / / / / /
2nd rail: / / / /
3rd rail: / / /
```
3. Calculate the length of each rail by dividing the length of the binary message by the number of rails and rounding up. In this case, the length of each rail is 6.
4. Distribute the binary message evenly among the rails, starting with the 1st rail, then the 2nd rail, and finally the 3rd rail:
```
1st rail: 1 1 0 0 1 1 / / / / /
2nd rail: / 1 / 1 / 1 / 1 / 0
3rd rail: / / 0 / / 1 1 1 0 1
```
5. Read the binary message column by column: 1100111111101110.
6. Convert the binary message back to hexadecimal. In this case, the decrypted message is 33F6.
Therefore, the hexadecimal message decrypted from the encrypted message CDEF using the Rail Fence cipher for binary numbers with 3 rails is 33F6.