Let's say technical documentation says >Message content is ended with \0 byte, followed by a digit between 0-10 describing font colour. What hacker does is pa

Let's say technical documentation says >Message content is ended with \0 byte, followed by a digit between 0-10 describing font colour. What hacker does is pass `\0\0` to check if null byte is valid digit or painfully crashes system an if invalid values are handled correctly when error handling mechanisms aren't described in documentation. I think what you mean by hacking is closer to RE.