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!

2B 53 53 48 20 4E 53 46 10 20 5D 53 59 20 57 53
50 5A 49 48 20 53 52 49 20 51 53 56 49 20 47 4C
45 50 50 49 52 4B 49 20 4D 52 20 5D 53 59 56 20
4E 53 59 56 52 49 5D 12 20 38 4C 4D 57 20 53 52
49 20 5B 45 57 20 4A 45 4D 56 50 5D 20 49 45 57
5D 20 58 53 20 47 56 45 47 4F 12 20 3B 45 57 52
0B 58 20 4D 58 23 20 15 16 1C 20 4F 49 5D 57 20
4D 57 20 45 20 55 59 4D 58 49 20 57 51 45 50 50
20 4F 49 5D 57 54 45 47 49 10 20 57 53 20 4D 58
20 57 4C 53 59 50 48 52 0B 58 20 4C 45 5A 49 20
58 45 4F 49 52 20 5D 53 59 20 58 53 53 20 50 53
52 4B 20 58 53 20 48 49 47 56 5D 54 58 20 58 4C
4D 57 20 51 49 57 57 45 4B 49 12 20 3B 49 50 50
20 48 53 52 49 10 20 5D 53 59 56 20 57 53 50 59
58 4D 53 52 20 4D 57 20 51 51 4A 48 51 4C 52 46
46 49 45 4A 12