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!

1E 46 46 3B 20 41 46 39 03 20 50 46 4C 20 4A 46
43 4D 3C 3B 20 46 45 3C 20 44 46 49 3C 20 3A 3F
38 43 43 3C 45 3E 3C 20 40 45 20 50 46 4C 49 20
41 46 4C 49 45 3C 50 05 20 2B 3F 40 4A 20 46 45
3C 20 4E 38 4A 20 3D 38 40 49 43 50 20 3C 38 4A
50 20 4B 46 20 3A 49 38 3A 42 05 20 2E 38 4A 45
7E 4B 20 40 4B 16 20 08 09 0F 20 42 3C 50 4A 20
40 4A 20 38 20 48 4C 40 4B 3C 20 4A 44 38 43 43
20 42 3C 50 4A 47 38 3A 3C 03 20 4A 46 20 40 4B
20 4A 3F 46 4C 43 3B 45 7E 4B 20 3F 38 4D 3C 20
4B 38 42 3C 45 20 50 46 4C 20 4B 46 46 20 43 46
45 3E 20 4B 46 20 3B 3C 3A 49 50 47 4B 20 4B 3F
40 4A 20 44 3C 4A 4A 38 3E 3C 05 20 2E 3C 43 43
20 3B 46 45 3C 03 20 50 46 4C 49 20 4A 46 43 4C
4B 40 46 45 20 40 4A 20 44 44 3D 3B 44 3F 45 39
39 3C 38 3D 05