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!

4D 75 75 6A 20 70 75 68 32 20 7F 75 7B 20 79 75
72 7C 6B 6A 20 75 74 6B 20 73 75 78 6B 20 69 6E
67 72 72 6B 74 6D 6B 20 6F 74 20 7F 75 7B 78 20
70 75 7B 78 74 6B 7F 34 20 5A 6E 6F 79 20 75 74
6B 20 7D 67 79 20 6C 67 6F 78 72 7F 20 6B 67 79
7F 20 7A 75 20 69 78 67 69 71 34 20 5D 67 79 74
2D 7A 20 6F 7A 45 20 37 38 3E 20 71 6B 7F 79 20
6F 79 20 67 20 77 7B 6F 7A 6B 20 79 73 67 72 72
20 71 6B 7F 79 76 67 69 6B 32 20 79 75 20 6F 7A
20 79 6E 75 7B 72 6A 74 2D 7A 20 6E 67 7C 6B 20
7A 67 71 6B 74 20 7F 75 7B 20 7A 75 75 20 72 75
74 6D 20 7A 75 20 6A 6B 69 78 7F 76 7A 20 7A 6E
6F 79 20 73 6B 79 79 67 6D 6B 34 20 5D 6B 72 72
20 6A 75 74 6B 32 20 7F 75 7B 78 20 79 75 72 7B
7A 6F 75 74 20 6F 79 20 6B 78 72 6E 79 78 6D 6F
6B 75 6F 67 34