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!

58 00 00 75 20 7B 00 73 3D 20 0A 00 06 20 04 00
7D 07 76 75 20 00 7F 76 20 7E 00 03 76 20 74 79
72 7D 7D 76 7F 78 76 20 7A 7F 20 0A 00 06 03 20
7B 00 06 03 7F 76 0A 3F 20 65 79 7A 04 20 00 7F
76 20 08 72 04 20 77 72 7A 03 7D 0A 20 76 72 04
0A 20 05 00 20 74 03 72 74 7C 3F 20 68 72 04 7F
38 05 20 7A 05 50 20 42 43 49 20 7C 76 0A 04 20
7A 04 20 72 20 02 06 7A 05 76 20 04 7E 72 7D 7D
20 7C 76 0A 04 01 72 74 76 3D 20 04 00 20 7A 05
20 04 79 00 06 7D 75 7F 38 05 20 79 72 07 76 20
05 72 7C 76 7F 20 0A 00 06 20 05 00 00 20 7D 00
7F 78 20 05 00 20 75 76 74 03 0A 01 05 20 05 79
7A 04 20 7E 76 04 04 72 78 76 3F 20 68 76 7D 7D
20 75 00 7F 76 3D 20 0A 00 06 03 20 04 00 7D 06
05 7A 00 7F 20 7A 04 20 78 7D 73 01 75 72 7E 04
04 76 79 00 3F