Which of the following cannot be transmitted over an amateur radio mesh network?

Even though an amateur radio mesh network often uses commercial off-the-shelf Wi-Fi hardware modified to operate on amateur frequencies, it is still bound by all FCC Part 97 rules. A fundamental rule of amateur radio is that you may not transmit messages encoded for the purpose of obscuring their meaning, which effectively bans standard network encryption like HTTPS or WPA2 payloads on amateur bands. While email and third-party traffic are perfectly legal over amateur frequencies provided they do not involve commercial interests or pecuniary gain, encryption remains strictly prohibited except for very specific telecommand applications for space stations or radio control craft. Therefore, security protocols that obscure the payload meaning cannot be used.