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!

46 6E 6E 63 20 69 6E 61 2B 20 78 6E 74 20 72 6E
6B 75 64 63 20 6E 6D 64 20 6C 6E 71 64 20 62 67
60 6B 6B 64 6D 66 64 20 68 6D 20 78 6E 74 71 20
69 6E 74 71 6D 64 78 2D 20 53 67 68 72 20 6E 6D
64 20 76 60 72 20 65 60 68 71 6B 78 20 64 60 72
78 20 73 6E 20 62 71 60 62 6A 2D 20 56 60 72 6D
26 73 20 68 73 3E 20 30 31 37 20 6A 64 78 72 20
68 72 20 60 20 70 74 68 73 64 20 72 6C 60 6B 6B
20 6A 64 78 72 6F 60 62 64 2B 20 72 6E 20 68 73
20 72 67 6E 74 6B 63 6D 26 73 20 67 60 75 64 20
73 60 6A 64 6D 20 78 6E 74 20 73 6E 6E 20 6B 6E
6D 66 20 73 6E 20 63 64 62 71 78 6F 73 20 73 67
68 72 20 6C 64 72 72 60 66 64 2D 20 56 64 6B 6B
20 63 6E 6D 64 2B 20 78 6E 74 71 20 72 6E 6B 74
73 68 6E 6D 20 68 72 20 6C 6C 65 63 6C 67 6D 61
61 64 60 65 2D