I guess you are done with Caesar I, aren't you?
The big problem with caesar is that it does not allow digits or other characters.
I have fixed this, and now I can use any ascii character in the plaintext.
The keyspace has increased from 26 to 128 too. \o/

Enjoy!

7F 27 27 1C 20 22 27 1A 64 20 31 27 2D 20 2B 27
24 2E 1D 1C 20 27 26 1D 20 25 27 2A 1D 20 1B 20
19 24 24 1D 26 1F 1D 20 21 26 20 31 27 2D 2A 20
22 27 2D 2A 26 1D 31 66 20 0C 20 21 2B 20 27 26
1D 20 2F 19 2B 20 1E 19 21 2A 24 31 20 1D 19 2B
31 20 2C 27 20 1B 2A 19 1B 23 66 20 0F 19 2B 26
5F 2C 20 21 2C 77 20 69 6A 70 20 23 1D 31 2B 20
21 2B 20 19 20 29 2D 21 2C 1D 20 2B 25 19 24 24
20 23 1D 31 2B 28 19 1B 1D 64 20 2B 27 20 21 2C
20 2B 20 27 2D 24 1C 26 5F 2C 20 20 19 2E 1D 20
2C 19 23 1D 26 20 31 27 2D 20 2C 27 27 20 24 27
26 1F 20 2C 27 20 1C 1D 1B 2A 31 28 2C 20 2C 20
21 2B 20 25 1D 2B 2B 19 1F 1D 66 20 0F 1D 24 24
20 1C 27 26 1D 64 20 31 27 2D 2A 20 2B 27 24 2D
2C 21 27 26 20 21 2B 20 25 25 1E 1C 25 20 26 1A
1A 1D 19 1E 66