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!

41 69 69 5E 20 64 69 5C 26 20 73 69 6F 20 6D 69
66 70 5F 5E 20 69 68 5F 20 67 69 6C 5F 20 5D 62
5B 66 66 5F 68 61 5F 20 63 68 20 73 69 6F 6C 20
64 69 6F 6C 68 5F 73 28 20 4E 62 63 6D 20 69 68
5F 20 71 5B 6D 20 60 5B 63 6C 66 73 20 5F 5B 6D
73 20 6E 69 20 5D 6C 5B 5D 65 28 20 51 5B 6D 68
21 6E 20 63 6E 39 20 2B 2C 32 20 65 5F 73 6D 20
63 6D 20 5B 20 6B 6F 63 6E 5F 20 6D 67 5B 66 66
20 65 5F 73 6D 6A 5B 5D 5F 26 20 6D 69 20 63 6E
20 6D 62 69 6F 66 5E 68 21 6E 20 62 5B 70 5F 20
6E 5B 65 5F 68 20 73 69 6F 20 6E 69 69 20 66 69
68 61 20 6E 69 20 5E 5F 5D 6C 73 6A 6E 20 6E 62
63 6D 20 67 5F 6D 6D 5B 61 5F 28 20 51 5F 66 66
20 5E 69 68 5F 26 20 73 69 6F 6C 20 6D 69 66 6F
6E 63 69 68 20 63 6D 20 67 67 60 5E 67 62 68 5C
5C 5F 5B 60 28