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!

27 4F 4F 44 20 4A 4F 42 0C 20 59 4F 55 20 53 4F
4C 56 45 44 20 4F 4E 45 20 4D 4F 52 45 20 43 48
41 4C 4C 45 4E 47 45 20 49 4E 20 59 4F 55 52 20
4A 4F 55 52 4E 45 59 0E 20 34 48 49 53 20 4F 4E
45 20 57 41 53 20 46 41 49 52 4C 59 20 45 41 53
59 20 54 4F 20 43 52 41 43 4B 0E 20 37 41 53 4E
07 54 20 49 54 1F 20 11 12 18 20 4B 45 59 53 20
49 53 20 41 20 51 55 49 54 45 20 53 4D 41 4C 4C
20 4B 45 59 53 50 41 43 45 0C 20 53 4F 20 49 54
20 53 48 4F 55 4C 44 4E 07 54 20 48 41 56 45 20
54 41 4B 45 4E 20 59 4F 55 20 54 4F 4F 20 4C 4F
4E 47 20 54 4F 20 44 45 43 52 59 50 54 20 54 48
49 53 20 4D 45 53 53 41 47 45 0E 20 37 45 4C 4C
20 44 4F 4E 45 0C 20 59 4F 55 52 20 53 4F 4C 55
54 49 4F 4E 20 49 53 20 4D 4D 46 44 4D 48 4E 42
42 45 41 46 0E