In what scenario is it permissible for amateur operators to send codes or ciphers?

The context of amateur radio operations is governed by regulations that prioritize transparency and public service, which is why the use of codes or ciphers is carefully restricted. Though it might seem appropriate to use ciphers in various situations, they are primarily allowed during contests. In these events, operators often use abbreviations, shorthand, and established codes to communicate efficiently and manage time effectively while adhering to the competitive format.

Emergency communications and relaying official communications must remain clear and comprehensible to ensure proper understanding and coordination among all parties involved, which is why the use of codes or ciphers is not allowed in those scenarios. Furthermore, using codes to conceal secret information is generally against the principles of amateur radio, as it contradicts the idea of open communication and access to information for all licensed operators. Thus, the correct understanding is that during contests, the use of codes or ciphers can be applied to enhance communication within the rules of that specific context.