| Name | Author | Description |
| rot13-lookup.c | Teknovore | Uses a table generated during runtime for the conversion. |
| rot13-shortest.c | N/A | Shortest implementation (yet), 64 bytes long! |
| rot13-sig.c | N/A | The above implementation condensed to fit into a signature. |
| rot13.c | Mike Acar | Speedy implementation without anything like tables |