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!

12 3A 3A 2F 20 35 3A 2D 77 20 44 3A 40 20 3E 3A
37 41 30 2F 20 3A 39 30 20 38 3A 3D 30 20 2E 33
2C 37 37 30 39 32 30 20 34 39 20 44 3A 40 3D 20
35 3A 40 3D 39 30 44 79 20 1F 33 34 3E 20 3A 39
30 20 42 2C 3E 20 31 2C 34 3D 37 44 20 30 2C 3E
44 20 3F 3A 20 2E 3D 2C 2E 36 79 20 22 2C 3E 39
72 3F 20 34 3F 0A 20 7C 7D 03 20 36 30 44 3E 20
34 3E 20 2C 20 3C 40 34 3F 30 20 3E 38 2C 37 37
20 36 30 44 3E 3B 2C 2E 30 77 20 3E 3A 20 34 3F
20 3E 33 3A 40 37 2F 39 72 3F 20 33 2C 41 30 20
3F 2C 36 30 39 20 44 3A 40 20 3F 3A 3A 20 37 3A
39 32 20 3F 3A 20 2F 30 2E 3D 44 3B 3F 20 3F 33
34 3E 20 38 30 3E 3E 2C 32 30 79 20 22 30 37 37
20 2F 3A 39 30 77 20 44 3A 40 3D 20 3E 3A 37 40
3F 34 3A 39 20 34 3E 20 38 38 31 2F 38 33 39 2D
2D 30 2C 31 79