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!

45 6D 6D 62 20 68 6D 60 2A 20 77 6D 73 20 71 6D
6A 74 63 62 20 6D 6C 63 20 6B 6D 70 63 20 61 66
5F 6A 6A 63 6C 65 63 20 67 6C 20 77 6D 73 70 20
68 6D 73 70 6C 63 77 2C 20 52 66 67 71 20 6D 6C
63 20 75 5F 71 20 64 5F 67 70 6A 77 20 63 5F 71
77 20 72 6D 20 61 70 5F 61 69 2C 20 55 5F 71 6C
25 72 20 67 72 3D 20 2F 30 36 20 69 63 77 71 20
67 71 20 5F 20 6F 73 67 72 63 20 71 6B 5F 6A 6A
20 69 63 77 71 6E 5F 61 63 2A 20 71 6D 20 67 72
20 71 66 6D 73 6A 62 6C 25 72 20 66 5F 74 63 20
72 5F 69 63 6C 20 77 6D 73 20 72 6D 6D 20 6A 6D
6C 65 20 72 6D 20 62 63 61 70 77 6E 72 20 72 66
67 71 20 6B 63 71 71 5F 65 63 2C 20 55 63 6A 6A
20 62 6D 6C 63 2A 20 77 6D 73 70 20 71 6D 6A 73
72 67 6D 6C 20 67 71 20 6B 6B 64 62 6B 66 6C 60
60 63 5F 64 2C